The budget lands as Trump's GOP allies in Congress are grappling with repealing and replacing Obama's health care law and looking ahead to a hard rewrite of the loophole-clogged tax code.
"In these risky times, this public safety and national security budget blueprint is a message to the world - a message of American strength, security and resolve", Trump said.
"We are no longer going to measure compassion by the number of programs or the number of people on those programs, but the number of people we help get off of those programs", he said, arguing that it is actually compassionate to cut government spending on inefficient programs.
The formal unveiling of the White House budget is a time-honored Washington ritual usually composed of a Rose Garden ceremony and a presidential tour around the country. Accomplishing some of Trump's goals isn't out of reach, Cole said, but some plans in the budget proposal are "not likely to survive".
WASHINGTON (AP) - Trump budget director Mick Mulvaney, defending an administration that promises more economic growth than many think it can deliver, said Tuesday it's the Obama administration that went overboard in its forecasts for growth.
Meanwhile, some U.S. allies also "fell prey" to the new budget plan: while Egypt, Israel and Jordan will continue to enjoy Washington's generosity, Ukraine will see tremendous cuts in United States financial assistance.
"All POTUS budgets are", he tweeted. Susan Collins, a Maine Republican.
"We've seen sort of a snapshot of the president's budget, and it seems rather harsh", Rep. Ileana Ros-Lehtinen (R-Fla.) said Tuesday morning. "I remain committed to working with both Republicans and Democrats to prioritize, strengthen, and defend the Great Lakes".
"It's not right when you look at it through the perspective of the people who pay taxes", he said.More news: Keylor Navas, Real Madrid clinch La Liga title in Spain
More news: Chinese, S. Korean officials seek to mend rift with meetings
More news: Trump vows to continue efforts for peace deal b/w Palestinians, Israel
The president's plan recommends $616bn in cuts to Medicaid, the government insurance programme for the poorest and many disabled Americans, while increasing border security spending by $2.6bn - including $1.6bn to begin construction on a wall along the US-Mexico border. The current USDA budget includes $1.7 billion for that program.
But the biggest changes in the proposed budget come in changes to the social safety net.
"We need people to go to work..."
"If we had a booming economy and all their assumptions worked out, then we wouldn't need as much safety net funding", she said, adding that it's unclear if those getting benefits could find work now without receiving assistance. "By slashing critical efforts to support education for students with disabilities, increase employment opportunities for workers with disabilities, provide affordable health care for people with disabilities and provide accessible housing, President Trump is leaving millions of Americans with disabilities to hang out to dry".
"We are not kicking anyone off of any program who really needs it", he said.
"We are going to do more with less and make the government lean and accountable to the people. And we will do that".
For fiscal 2018, the budget would also shift 54 billion dollars from non-defense discretionary spending to defense by enacting major cuts to the State Department, the Environmental Protection Agency and other agencies.
"The budget will not pass in its current state, but people will keep an eye on any sort of indication of corporate tax reform as well as infrastructure spending", said Nadia Lovell, US equity strategist at J.P. Morgan Private Bank in NY.
"This has been a very long period of growth and we're at the high end already", Rivlin said. He has called it a hoax perpetrated by the Chinese multiple times, although he has seemingly softened that stance in recent months.
The White House budget also introduces funding for paid parental leave - something that's traditionally a Democratic proposal, not a Republican one - costing $25 billion over a decade.
Trump in February promised what he said would be "one of the greatest military buildups in American history" but hawkish Republicans have said his proposed increases are insufficient.