President Donald Trump's personal attorney Rudy Giuliani tells ABC News he's working as part of the president's defense team in his upcoming second impeachment trial -- and that he's prepared to argue that the president's claims of widespread voter fraud did not constitute incitement to violence because the widely-debunked claims are true.

"I'm involved right now … that's what I'm working on," Giuliani told ABC News Chief White House Correspondent Jonathan Karl.

A few hours later, Giuliani -- who led the president's efforts to overturn the 2020 election results -- was spotted at the White House.

Giuliani's involvement in Trump's impeachment defense comes as many of the lawyers involved in the president's first impeachment, including White House counsel Pat Cipollone and his deputies and outside lawyers Jay Sekulow and Jane and Marty Raskin, do not plan to return for the second trial.

Regarding impeachment, Giuliani also said that he personally believed Trump should move to dismiss the trial outright.

That it was the only impeachment ever done in what, two days, three days," Giuliani told ABC News.

If the effort to dismiss the impeachment article fails, which is likely, Giuliani said he wouldn't rule out the president testifying.

Trump's lawyers were opposed to him testifying during his first impeachment trial, but Giuliani says this situation is different and the impeachment defense is "much more straightforward.".

Sources close to the president had recently told ABC News that Trump had been increasingly irritated with Giuliani and had not been taking his calls, but he now appears still very much involved in the discussions about how to handle the impeachment trial.