Trump will likely reiterate his campaign pledges to push back against gun control measures.
Secretary of State Rex Tillerson on Friday urged the United Nations to take new sanctions against North Korea.
Congress is expected to pass a measure to keep the government running for a week while it negotiates a longer-term funding bill.
The Trump administration had lacked consistency on that part of the tax plan since they unveiled it.
Trump's proximity to executives and his push for splashy policy announcements gives CEOs a front seat to some decisions.
Congress is looking to avert a shutdown as government funding expires Friday.
House Speaker Paul Ryan is scheduled to hold his weekly Capitol briefing.
Mnuchin has repeatedly said the White House wants to pay for the plan with economic growth.
"We've got some differences on the rates," Rep. Kevin Brady tells CNBC.
Mulvaney, a budget hawk, tells CNBC "there's no way to know" yet what effect the plan will have on the deficit.