President Trump has tapped Mark Green, a former U.S. ambassador and congressman, to lead the United States Agency for International Development.

Green served four terms as a Republican U.S. representative from Wisconsin, before becoming the U.S. ambassador to Tanzania in 2007 under the George W. Bush Administration.

He currently serves as president of the International Republican Institute, an organization that seeks to promote democracy around the world. Sen. John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE (R-Ariz.) serves as chairman of the group's board of directors.

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If confirmed in the Senate, Green will take over USAID as the U.S. foreign aid budget faces sharp potential cuts under the Trump administration. A budget plan released by the White House in March proposes a 28 percent cut for U.S. foreign aid and diplomacy.

Secretary of State Rex Tillerson applauded the nomination, saying Green will help prioritize "America's future development investments."

"USAID plays a vital role in protecting U.S. national security by fostering stability, resolving conflict, responding to humanitarian crises, and ending infectious diseases," Tillerson said in a statement. "He will serve as an outstanding leader for the men and women of USAID, and will work to build a more safe and prosperous global community."