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President Donald Trump departs to travel to New York from the White House in Washington, August 14, 2017. Image Credit: Reuters

WASHINGTON: President Donald Trump has stepped up his attacks on Republican senators, an approach he may regret if he is someday impeached and the Senate has to weigh charges against him stemming from an investigation into Russian meddling in the 2016 US election. 

More than half of the 11 Republicans on the Senate Judiciary Committee, which would be central to any proceeding to remove Trump from office, have tangled with the Republican president, including on Thursday when he fired off early-morning tweets.

In one Twitter series, Trump called Senator Lindsey Graham "publicity seeking" and said he "just can't forget his election trouncing" in the 2016 presidential race.

Trump also assailed Senator Jeff Flake, another Republican critic, as "a non-factor in the Senate," adding, "He's toxic."

Flake and Graham are members of the Judiciary Committee, whose Chairman Chuck Grassley has urged Trump to tone it down.

"He should be 100 percent sticking to ideas and forget about personalities," Grassley said on Friday when pressed on whether Trump might find himself without the friends in Congress he would need to defend himself in an impeachment proceeding.

For his part, Grassley said his views would not be colored by past presidential sniping.

"Let's say the House of Representatives impeached the president of the United States. Then I'm a juror," Grassley said.

"The Senate is the jury that decides whether he should be impeached. The jury is supposed to be impartial."