US is not withdrawing from the world, Rubio says during testy hearings in Congress

The administration proposed a new $2.9 billion America First Opportunity Fund that would take on foreign aid, building on "lessons we learned from USAID," Rubio said.

Rubio defended cuts to foreign aid - he was an advocate of such aid during his 14 years in the Senate - while slashing State Department staff and the U.S. Agency for International Development, which used to spend roughly $40 billion a year and is being folded into the State Department. MORE