Trump's budget plan sends a 'very powerful message': Budget chiefWATCH: Trump's director of the Office of Management and Budget previews Trump's address to Congress and discusses the administration's plan to boost defense spending without cutting Medicare or Social Security.President Trump's budget plan sends a "very powerful message" that he wants to move spending "from overseas to back in this country," Mick Mulvaney, the administration's Office of Management and Budget Director, said on ABC's "Good Morning America" today."The president is doing what he'd say he'd do when he ran," Mulvaney said to ABC News chief anchor George Stephanopoulos. "What you see in this budget is exactly what the president ran on."Mulvaney, a former South Carolina congressman and favorite of tea party Republicans, was sworn in earlier this month after being confirmed by a narrow 51-49 vote in the GOP-controlled Senate.Stephanopoulos asked Mulvaney on "GMA" if the president would also try to reduce the federal deficit and how he could do that if he greatly boosts military spending without touching Social Security or Medicare.The budget director said that subject will require "bigger discussions for another day."The president's budget blueprint that is being sent to Congress for review proposes a $54 billion increase in defense spending with cuts to foreign aid and domestic programs."This budget will be a public safety and national security budget," Trump told the National Governors Association on Monday. He said the budget will include an increase in "all spending for federal law enforcement."Administration officials have stressed that the budget plan is merely a first draft and shell of what it will send Congress in a formal budget request next month.ABC News' Alexander Nallin and The Associated Press contributed to this report.