The Democratic-controlled House of Representatives impeached Trump in December on two charges in the Ukraine matter, setting the stage for the trial in the Republican-led Senate on whether to remove him from office.
Mr McConnell convened a closed-door meeting of his party's senators shortly after Mr Trump's legal team made its closing arguments in the trial on Tuesday.
Trump's legal team's arguments came after the prosecution from the House of Representatives used almost all of its 24 hours over three days to present its side as to why Trump should be removed from office. The questions come ahead of a vote on whether to bring forward witnesses and documents as part of the Senate trial. They also argued that Trump has not committed any crime and therefore can not be removed from office, even though many legal scholars say breaking a law is not required in order to secure an impeachment conviction that would remove a president from office. Both Democrats and Republicans should bear in mind that if witnesses are approved, neither side may be entirely happy with what they get. Although two Republicans - Romney and Collins - have indicated they are likely to want to hear from Bolton, it is unclear whether there will be two additional GOP votes. Bolton has recently said that he would agree to testify before the Senate if subpoenaed.
If the witnesses that Trump critics are demanding were all that critical to the House's impeachment case, one would think that the House would have at least attempted to secure their testimony.
"Bolton claims that the leaks have nothing to do with boosting his sales for books, but people are suspicious", Colbert said, adding that the quotes leaked the same day the Amazon product page went live.
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"The bar for impeachment can not be set this low", said Jay Sekulow, another Trump lawyer.
After Bolton's tenure as National Security Adviser ended, Engel said in his statement, he reached out to Bolton to talk to him, in order to aid the committee's foreign policy oversight efforts.
US Senate Majority leader Mitch McConnell has told senators privately that he does not yet have the votes to block new witnesses in Donald Trump's impeachment trial. Engel said Bolton suggested to him in a September 23 phone call that the panel should look into Trump's removal last May of Marie Yovanovitch as American ambassador to Ukraine, a pivotal event in the Ukraine matter.
The final decision on witnesses may hinge on a few undecided Republican senators.
Told that was a serious charge to level against a former Trump adviser, Giuliani replied, "It's not serious". But after this week's leaks about the book, Cornyn questioned whether there would be much value in hearing from Bolton, saying "it's nothing different than what we've already heard".
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What did the White House say?
The Senate is expected to acquit Trump but allowing witnesses such as Bolton could inflict political damage on the Republican president as he seeks re-election on November 3.
Trump was impeached by House Democrats on December 18 for abuse of office and obstruction of Congress.
As soon as House Democrats adopted two articles of impeachment against President Trump Dec. 18, they started making demands about how the Republican-controlled Senate should conduct the president's impeachment trial. Democrats simply claimed that Trump represented such an existential threat to the nation that impeachment had to be rushed.
"If John Bolton says that in the book, I believe John Bolton, " Kelly said. Mitt Romney of Utah and Susan Collins of ME, expressed support for the idea, but have not yet sided firmly with the Democrats.
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Both senators have acknowledged the need for a fair trial, despite disagreeing on the procedural mechanisms to achieve one. In the Senate, only a handful of Republican lawmakers have suggested they would not simply support his exoneration.
"But I'm sorry to say you were also prophetic". It is the third Senate presidential impeachment trial in US history. They apparently fear that the established process will not give them what they want, so they attempt to create a different process.