Rep. Zoe Lofgren Zoe Ellen LofgrenTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence DHS opens probe into allegations at Georgia ICE facility House passes legislation to boost election security research MORE (D-Calif.), a House impeachment manager, said Sunday that President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE should be "more presidential" after he sent a tweet criticizing Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.), the lead House Democrat who is presenting the impeachment case against Trump in the Senate.

"The president has a tendency to say things that seem threatening to people," Lofgren said on CNN's "State of the Union" when questioned about Trump's Sunday morning tweet.

"He ought to get a grip and be more presidential," Lofgren added.

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“The President has a tendency to say things that seem threatening to people… he really ought to get a grip and be a little more presidential.” House impeachment manager @RepZoeLofgren reacts to President Trump’s latest tweet targeting Rep. Adam Schiff. #CNNSOTU pic.twitter.com/Mz8gLJPPeM — State of the Union (@CNNSotu) January 26, 2020

Her comments came in response to Trump's morning tweet, which said: "Shifty Adam Schiff is a CORRUPT POLITICIAN, and probably a very sick man. He has not paid the price, yet, for what he has done to our Country!"

Schiff has been a frequent target of Trump's attacks on Twitter.

Trump's tweet came after his defense team attacked Schiff's credibility during their opening arguments on Saturday in the Senate impeachment trial.