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President Trump reacted for the first time to the news that his former national security adviser John Bolton is prepared to testify if issued a subpoena, telling reporters Bolton “would know nothing about what we’re talking about," despite the fact that Bolton was his adviser at the time and has first hand knowledge of the hold on Ukrainian aid.

“That’s gonna be up to the lawyers. It’ll be up to the Senate. And we’ll see how they feel," Trump said. "He would know nothing about what we’re talking about because if you know, the Ukrainian government came out with a very strong statement — no pressure, no anything. And that’s from the boss. That’s from the President of Ukraine…”

"Frankly, if you look at it, and you look at everything all they have to do is read the transcripts," he said.

Trump continued to lament his impeachment and trial as well as his “perfect” phone call with Ukrainian President Volodymyr Zelensky.

Some background: Bolton announced in an unexpected and newsworthy statement Monday that he is prepared to testify if issued a subpoena as part of a Senate impeachment trial.

Bolton is potentially a crucial witness, as he had firsthand knowledge of many of the events that formed the House's impeachment of the President over his dealings with Ukraine. The House sought his testimony but ultimately never subpoenaed Bolton, and Democrats withdrew their subpoena for his former deputy after it was challenged in court, as Democrats wanted to move forward with their impeachment probe and not wait for the court's decision.