President Donald Trump will begin the next phase of his massive overhaul of the federal government Wednesday, directing agencies in a memo to bring their operations in line with his proposed budget immediately.

Agencies he's said he wants to slash should cut their workforce accordingly, a copy of the memo that was provided to DailyMail.com says.

'This is a big part of draining the swamp,' Office of Management and Budget Director Mick Mulvaney told reporters Tuesday.

Trump will end his federal hiring freeze as part of the top-to-bottom reorganization.

President Donald Trump's will begin the next phase of his massive overhaul of the federal government Wednesday, directing agencies in a memo to bring their operations in line with his proposed budget immediately

Mulvaney said some departments would see their operations beefed up in the process. Others will see cuts.

'Consistent with the president's priorities in the budget, certain agencies will end up hiring more people,' he said.

The Department of Defense, which Trump has designated for a $54 billion plus up, and the Veterans Affairs Department, slated to receive $4.5 billion more than it did this fiscal year, should plan to bring on additional support staff, he said.

Environmental Protection Agency workers should brace themselves for layoffs, Mulvaney indicated. The federal agency will get $2.5 billion less in fiscal year 2018 if Trump has his way.

'It's up to them to sort of come up with ideas on how to do that and effectively put the president's priorities into play,' he said of the EPA on Tuesday.

The White House official talked up the effort as a 'major accomplishment' and bragged that Trump was getting the gears in motion in his first 100 days, even though the the president's discretionary spending budget was poorly received by Congress and is unlikely to make it through the legislative branch.

Lawmakers on both sides of the aisle have rejected Trump's $10.9 billion cut to the State Department, which the administration said is meant for the foreign aid program.

Trump's request for $9.2 billion less for the Department of Education is deeply unpopular, as well. A large portion of the funds would come from the Pell Grant program.

A $3 billion reduction in funds for the Community Development Block Grant program, which helps to fund Meals on Wheels, was also met with an uproar, particularly among Democrats.

Some of the changes can be forced through executive authority.

But Mulvaney also acknowledged 'there will be certain things for which we will need a legislative authority.'

NOT MY PROBLEM: Office of Management and Budget Director Mick Mulvaney told reporters Tuesday that it will be up to agencies like the EPA that Trump has targeted for reductions to figure out which employees to lay off

'We don't know what those are yet because we don't know what the final plan looks like, but certainly we're hopeful to be able to have congressional buy-in to try and get some of this accomplished,' he said.

In the meantime the White House wants agencies to 'begin taking immediate actions to achieve near-term workforce reductions and cost savings' as they ready themselves for the funding levels that were outlined in Trump's budget blueprint.

'The President's FY 2018 Budget should drive agencies' planning,' the document says.

Trump's full budget is due to come out in May. Plans for reform are due to land on Mulvaney's desk by September. Drafts are due on June 30.

The Office of Management and Budget will release the final 'Government-wide Reform Plan' when it submits Trump's FY 2019 budget, the memo says.

Mulvaney could not say Tuesday how many federal workers might be affected.

He said the ones that remain should welcome the changes, though, because the Trump administration wants to remunerate workers who are pulling their weight.

'The president wants to reward good employees. He's famous for doing that,' Mulvaney stated. 'Go down to the Trump hotel and ask people who used to work for him in the private sector, he's a great boss to work for and he wants to reward people who do a good job.'

Workers should not lose moral over the looming changes, he said, and 'focus on who's getting fired.'

'That's the wrong message to take from this. The right message is we're trying to figure out a way to make the government more accountable.'