Murkowski also raised concern that the House rushed the impeachment process, as some members called for its completion before the holiday recess.
Trump retweeted the post just before midnight Friday.
"If the president would tweet a little bit less, it wouldn´t cause brain damage". I think she knows they had a weak case.
Trump was impeached on December 18 by the Democratic-led House of Representatives on two charges over his pressuring Ukraine to announce an investigation of Biden, a former vice president and a top contender for the Democratic presidential nomination, and Biden's son.
Mr Biden, the former United States vice president seeking the Democratic nomination for the 2020 election, tweeted that during four decades in both Congress and the White House he had "always complied with a lawful order". "Look, if you have a rigged trial there's no exoneration in acquittal".
Twitter told The Associated Press that an outage with one of its systems caused tweets on some accounts, including Trump's, to be visible to some but not others.
On Saturday morning, Biden walked back his comments and said he wanted to clarify his original statement to The Register. "There'll be no difference between the president's position and our position as to how to handle this".
"Look, the whistleblower should have testified a long time ago", Scalise told Fox.
"A lot of us didn't see coming that (Speaker Pelosi) would sit on the articles of impeachment rather than immediately send them over to the Senate, so she's playing procedural games at this point", said Banks.
Democrats have also angrily berated the Republicans´ apparent strategy of allowing no live witnesses or new documentary evidence at the trial.
Gabbard, a 2020 Democratic presidential candidate, said she voted against impeachment because it did not have bipartisan support. A Ukrainian gas company had hired Hunter Biden when his father was vice president and the key man of the Obama administration in Ukraine.
With Trump's first term ending in 13 months, they are truly desperate to find anything they can use to prevent his re-election.
Gabbard (left and right) voted "present" on the articles of impeachment against Trump.
But Van Hollen, who heads the Democratic Congressional Campaign Committee, warned that any Senate trial that barred both sides from calling witnesses or providing new documents would amount to a "sham" and a "rigged trial".