“You don’t impeach presidents for doing a good (great!) job,” he insisted, before accusing his rivals of “treasonous crimes”.
It followed his frequently incoherent speech to Republican members of Congress about the Clean Waters Act, in which he suggested the US was uninhabited until 25 years ago.
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Donald Trump delivered a rambling and at times incoherent speech to a group of House Republicans in Baltimore on Thursday night.
He promised tax cuts for the middle class before mocking Xi Jinping, Joe Biden and the late John McCain, before telling the room that if Democrats won the election the country would "go to hell".
The president was a guest at an annual Republican retreat in Baltimore.
At one point in his speech the president suggested that the US was first inhabited 25 years ago.
He was speaking about the Clean Waters Act at the time.
“Let’s say the history of our country over the last 25 years, I would say that the first few years they probably had cleaner air and cleaner water because there was nobody here," the president said.
Elsewhere, China has announced that it will suspend tariffs on goods to the US.
The country, which is currently locked in a trade war with the US, suspended tariffs on soybeans and pork.
The gesture is a conciliatory one, ahead of negotiations.
While the president spoke in Baltimore, Democratic presidential hopefuls faced off in a televised debate.
"For Mr Biden, the front-runner who has been dogged throughout the campaigns with attacks over his perceived gaffes and past support of policies that have since been seen as out-of-date, the night was a strong performance."
The president imitated Xi Jinping in remarks at Baltimore on Thursday.
"He is tough, oh boy...furious kind of a guy. He wants Sleepy Joe! Can you imagine those guys in a room?"
In a riff on anti-environmentalism, he also blamed energy efficient light bulbs for making him "look orange."
"The light's no good! I always look orange," he joked.
"And so do you. The light is the worst."
Mr Trump also returned to his familiar Pocahontas insult, aimed at Elizabeth Warren.
"I thought she was gone! Now it looks like she could beat sleepy Joe," he said.
Joe Biden is still considered the Democratic front runner but his poll lead has fallen in recent days.
Impeachment proceedings came ever closer yesterday, after the House Judiciary Committee passed a vote to set the rules for possible hearings.
"The resolution passed on Thursday is a technical step, and the committee would still have to introduce impeachment articles against Mr Trump and win approval from the House to bring charges against him," reports Chris Riotta.
Beto O'Rourke has said a state republican lawmaker sent him a "death threat" after he tweeted about banning assault rifles in the US.
"My AR is ready for you Robert Francis," Briscoe Cain, a Texas politician responded on Twitter.
Mr O’Rourke’s full name is Robert Francis O’Rourke. “Beto” is a childhood nickname which he is known by.
“This is a death threat, representative,” Mr O’Rourke said. “Clearly, you shouldn’t own an AR-15—and neither should anyone else.”
Fellow Democrats, including Alexandria Ocasio Cortez, spoke out in support of Mr O'Rourke following the incident.
Donald Trump has begun his day on Twitter by questioning why anyone would want him impeached.
"You don’t impeach Presidents for doing a good job," says the US president, before ending with his traditional exclamation: "Sad!"
Donald Trump's furious attempt to list his "achievements" may be a response to the resolution passed by the House Judiciary Committee yesterday, which is seen as seen as a major step forward in the panel’s investigations into the president.
‘We have a constitutional, historical, and moral obligation to fully investigate these matters,’ house judiciary chair says
Meanwhile the American economist and Nobel laureate Paul Krugman has demolished Mr Trump's claims about the US trade war with China.
The president has repeatedly claimed that China is paying the tariffs. "Trump's claim is just false," says Mr Krugman.
Ivanka Trump reportedly told a fundraising event full of rich donors that she got her "moral compass" from her father.
Donald Trump was greeted by a giant balloon depicting him as a rat when he arrived in Baltimore.
It was a reference to the president's description of the city as a "disgusting, rat and rodent infested mess" where "no human being would want to live".
Lurid inflatable showing the president as a huge rodent with yellow hair and a red tie is paraded on a street renamed President Barack Obama Ave
The commander-in-chief was also roundly mocked on social media after he mispronounced his vice-president's name as "Mike Pounce" and blamed energy-efficient lightbulbs for making him look orange.
Vice-president becomes 'Mike Pounce' in speech slip-up
"Democrats are crying foul after ABC apparently ran an advert showing a picture of representative Alexandria Ocasio-Cortez engulfed in flames, revealing a bunch of skulls behind it, during the third Democratic debates in Houston," reports Clark Mindock.
"The video includes a woman attacking Ms Ocasio-Cortez for her embrace of socialism, and claiming that socialism has led to massacres in the past."
The congresswoman criticised ABC for airing the advert in a series of tweets posted on Friday.
"They profit from burning my likeness on TV," she said.
"But who pays for heightened security? Who answers the phones for the threats resulting from a violent, false ad?"
A US court has revived a lawsuit claiming Donald Trump violated the constitution by profiting from foreign and domestic officials who visited his hotels and restaurants, adding to the corruption claims against the president.
The lawsuit accuses him of failing to disentangle himself from his businesses, making him vulnerable to inducements by officials seeking to curry favor.
The case alleged violations of the US Constitution’s anti-corruption “emoluments” provisions, which ban the president from accepting gifts or payments from foreign governments without congressional consent.
The US Circuit Court of Appeals set aside a lower court ruling that had thrown out the case because the people who sued could not prove they were harmed by the president's actions.
Dozens of protesters gathered in downtown Baltimore yesterday as Donald Trump made his first visit to the city since he blasted it as "disgusting" and "rodent-infested" in hotly debated tweets in July.
The chilly reception came after the president lashed out on Twitter at Elijah Cummings, a prominent African-American congressman from Baltimore, calling him a "brutal bully" who should concentrate on cleaning up his "disgusting, rat and rodent infested" district rather than criticizing the work of immigration officers on the Mexican border.
Mr Trump received a warmer reception behind closed doors, while speaking at an annual retreat for House Republicans.
"We are going to fight for the futures of cities like Baltimore that have been destroyed by decades of failed and corrupt rule," he said.
The president is expected to meet with Moon Jae-in, the South Korean leader, at the United Nations this month.
Seoul and Washington are working to fix a date for the meeting during Mr Moon's trip to New York for the UN General Assembly later this month, the South Korean leader's spokesperson said.
The announcement came days after North Korea said it was willing to reopen denuclearisation talks with the United States within the month.
The negotiations stalled after a failed summit in February between Donald Trump and North Korean leader Kim Jong Un, but the two agreed to revive talks when they met in June at the inter-Korean border.
Donald Trump has, once again, blamed illegal immigration for societal problems in the US.
"Illegal Immigration costs the USA over 300 Billion Dollars a year," he claimed on Twitter.
"There is no reason for this, and things are being set in motion to have this number come WAY DOWN. Democrats could end Loopholes and it would be a whole lot easier, and faster."
“By the way today we have the cleanest air, we have the cleanest water that we’ve ever had in the history of our country,” he said.
Mr Trump then appeared to suggest that the history of the US was merely 25 years long.
“Let’s say the history of our country over the last 25 years, I would say that the first few years they probably had cleaner air and cleaner water because there was nobody here.”
The president was speaking in Baltimore, a city which he attacked repeatedly last summer.
He also celebrated a "historic milestone" when the senate approved his 150th federal judge, and sent out some rogue tweets about vaping.