Bush directly criticized the Trump administration's move to fold the U.S. Agency for International Development into the State Department on Monday during a video tribute for the agency's staffers.

Barack Obama and George W. Bush have come together to speak out against what they are calling a “colossal mistake” by President Donald Trump. That mistake?

The videoconference marked the end of USAID's 63-year run as an independent agency before its absorption into the State Department.