President Donald Trump Monday denied that he told his former national security advisor John Bolton that military aid to Ukraine was tied to Kiev investigating his political rivals.
Trump's tweets came after The New York Times reported Sunday that Bolton alleges as much in a draft of his upcoming book.
"I never told John Bolton that the aid to Ukraine was tied to investigations into Democrats, including the Bidens. In fact, he never complained about this at the time of his very public termination," Trump tweeted in the early hours of Monday.
"If John Bolton said this, it was only to sell a book."
In response to The Times' report, the lead House manager in the trial, Adam Schiff, tweeted that Trump had "blocked our request for Bolton's testimony."
House Speaker Nancy Pelosi said that Senate Republicans' refusal to hear Bolton or other witnesses and documents is "now even more indefensible."