Democratic presidential candidate Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE on Saturday clarified a prior statement that he would not comply with a Senate subpoena in President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's impeachment trial, saying that the matter concerns "Trump’s conduct, not mine."

"I have always complied with a lawful order and in my eight years as VP, my office — unlike Donald Trump and Mike Pence Michael (Mike) Richard PenceFormer Pence aide: White House staffers discussed Trump refusing to leave office Pence vows for law and order everywhere Trump met with chants of protest as he pays respects to Ruth Bader Ginsburg MORE — cooperated with legitimate congressional oversight requests," the former vice president said on Twitter.

"But I am just not going to pretend that there is any legal basis for Republican subpoenas for my testimony in the impeachment trial," he continued. "That is the point I was making yesterday and I reiterate: this impeachment is about Trump’s conduct, not mine."

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I want to clarify something I said yesterday. In my 40 years in public life, I have always complied with a lawful order and in my eight years as VP, my office — unlike Donald Trump and Mike Pence — cooperated with legitimate congressional oversight requests. — Joe Biden (@JoeBiden) December 28, 2019

But I am just not going to pretend that there is any legal basis for Republican subpoenas for my testimony in the impeachment trial. That is the point I was making yesterday and I reiterate: this impeachment is about Trump’s conduct, not mine. — Joe Biden (@JoeBiden) December 28, 2019

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The subpoenas should go to witnesses with testimony to offer to Trump’s shaking down the Ukraine government — they should go to the White House. — Joe Biden (@JoeBiden) December 28, 2019

"The reason I wouldn't is because it's all designed to deal with Trump doing what he's done his whole life, trying to take the focus off him," he told the paper.

Trump was impeached after a July 25 phone call in which he asked Ukraine's president to look into unsubstantiated allegations of corruption against Biden and his son.

Some of the president's allies have floated the idea of subpoenaing the former vice president, who has denied wrongdoing, according to the Des Moines Register.

Trump last month asserted that the Bidens should testify in the House's impeachment inquiry.

The House voted late last month to impeach Trump, charging him with abuse of power and obstruction of Congress.

The president has denied wrongdoing and blasted the impeachment process as a "witch hunt."

Two-thirds of the Republican-led Senate would have to vote for Trump's ouster in order for him to be removed from office.

Updated: 12:45 p.m.