Trump 2nd term updates: Trump attends the Super Bowl

Ahead of another call with Canadian Prime Minister Justin Trudeau at 3 p.m. on tariffs, President Donald Trump criticized Canada as "very tough to do business with."

"And we can't let them take advantage of the U.S.," Trump said in the Oval Office on Monday.

The comments come after Trump pushed back tariffs on Mexico for at least a month after new agreements, including 10,000 Mexican soldiers being placed on the border to try to curb the flow of drugs into the United States.

President Donald Trump signed an executive order in the Oval Office charging the Department of Treasury and others in his administration to start working on the process to create an "American sovereign wealth fund."

Howard Lutnik, Trump's pick for commerce secretary, said the fund could be set up within the next 12 months.

"Other countries have, sovereign wealth funds and they're much smaller countries, and they're not the United States. We have tremendous potential in this country," Trump said.

Trump also signed five designations for special envoys -- including Steve Witkoff, Ric Grenell and Mark Burnett. He also signed appointments for 28 sub-Cabinet level officials, including department general counsels.

Secretary of State Marco Rubio confirmed he's the acting administrator at USAID and expressed his concerns with the agency on Monday.

"My frustration with USAID goes back to my time in Congress," Rubio, a former senator, told reporters during his diplomatic trip to Central America. "It's a completely unresponsive agency."

"It's supposed to respond to policy directives of the State Department, and it refuses to do so. So the functions of the USAID -- there are a lot of functions of USAID that are going to continue, that are going to be part of American foreign policy but it has to be aligned with American foreign policy."

Secretary of State Marco Rubio has been made acting administrator of USAID, multiple sources told ABC News.

The news comes amid turmoil at the agency and is the latest step in the Trump administration's effort to move USAID under the State Department.

-ABC News' Will Steakin, Alexander Mallin and Shannon Kingston