Congressional leaders on Monday invited the head of NATO to address a joint session of Congress next month amid concerns about President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's commitment to the transatlantic alliance.

Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) agreed to invite NATO Secretary General Jens Stoltenberg on Wednesday, April 3 at 11 a.m. The address will come a day before NATO's 70th anniversary on April 4.

"During this critical time for the United States, NATO and the European Union, the U.S. Congress and the American people look forward to your message of friendship and partnership, as we work together to strengthen our critical alliance and advance a future of peace around the world," Pelosi wrote in a letter to Stoltenberg on behalf of bipartisan House and Senate leaders.

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Stoltenberg's visit will offer members of Congress the opportunity to show bipartisan support for NATO. But it also gives Stoltenberg a chance to rebut any criticisms from Trump and make the case for the importance of the alliance.

Pelosi recently visited Brussels, where the alliance is headquartered, in February as part of a congressional delegation and met with NATO leadership, including Stoltenberg.

Stoltenberg's visit will mark the first joint address to Congress from a foreign leader since Pelosi returned to the Speaker's Office in January.

The House passed a resolution in January to reaffirm bipartisan support for the alliance, with only 22 conservative Republicans in opposition.

Its passage came after The New York Times reported that Trump had repeatedly floated leaving NATO in the past year. Trump has repeatedly called for NATO members to increase defense spending.

Current and former administration officials in support of the alliance worried that the withdrawal would embolden Russia and threaten European alliances.

The Senate also passed a resolution in support of NATO last July ahead of Trump's visit to the annual NATO summit in Brussels. It also came ahead of his meeting with Russian President Vladimir Putin in Helsinki, Finland, days later.

—Updated at 6:01 p.m.