Trump 2nd term updates: Trump excludes low-value shipments from looming tariffs

The acting IRS commissioner announced his resignation internally on Tuesday, according to copies of the internal email obtained by ABC News, and a new acting commissioner has been announced by the Treasury Department.

Douglas O'Donnell's retirement, which takes effect Friday, comes in the middle of tax filing season and amid thousands of layoffs at the agency.

In his email, O'Donnell cited family reasons for his decision, writing that he considered it multiple times in the past.

"I assist in caring for my mother and mother-in-law, but they are both in declining health and I have been much less available than a son or son-in-law should be. My spouse and sisters have picked up the slack, and I need to do my part," he said in the email.

O'Donnell also gave a shoutout to those with whom he has worked and to the administrative staff in the offices.

"To all of you, I am grateful for your patience, support and courage in the face of adversity," he said.

O'Donnell added that he recommended to the Treasury Department that Melanie Krause be selected as the new acting director, and it agreed.

-ABC News' Olivia Rubin and Ben Siegel

When asked about Ukrainian President Volodymyr Zelenskyy's upcoming visit to Washington, D.C., on Friday, President Donald Trump floated a "very big deal" incoming.

"I hear that he's coming on Friday. Certainly it's OK with me if he'd like to. And he would like to sign it together with me. And I understand that's a big deal, a very big deal," Trump said.

"It's a very big deal. It could be $1 trillion deal," he continued. "It could be whatever. But it's rare earths and other things."

During a signing of executive orders, President Donald Trump was asked about the email requests sent out to federal employees and whether or not it's mandatory.

"Well, it's somewhat voluntary, but it's also if you don't answer, I guess you get fired," he said.

The president claimed without details that nobody knows who's working for the government and the email would be a way to square that out.

"If they're there and they're working, they're able to say they did five things during work, and that means they're working and they're with us, and they have no further obligation if they're not, it could be there's no such person. It could be that the person's no longer working," he said.

Trump did not elaborate if Elon Musk, who first announced the email and said people had a deadline of Monday night, communicated to him about this claiming "the buck stops here."

"If they don't write back they end up eventually losing their job. We give them extensions," Trump said without elaborating.

Ukraine and the U.S. have agreed to terms on a deal relating to critical minerals and other resources, according to a senior Ukrainian official.

This comes after the Trump administration demanded Ukraine President Volodymyr Zelenskyy sign a deal that would have Ukraine pay the U.S. $500 billion through a fund, financed by taking 50% of revenues of Ukraine's resources, including minerals, oil and gas, as well ports and other infrastructure, to which Zelenskyy declined.

-- ABC News' William Gretsky