Sen. Tim Kaine said Sunday that it was "unconstitutional" for President Trump to launch a military strike against Iran without congressional approval.

Defense Secretary Pete Hegseth said Sunday that despite a surprise attack overnight on Iranian nuclear sites, America "does not seek war."

A transcript of President Donald Trump's speech on U.S. airstrikes on Iran on Saturday as transcribed by The Associated Press:

President Trump's decision to strike three nuclear sites in Iran could deepen a divide among some of the Republican's supporters, including high-profile backers who had said any such move would run counter to the anti-interventionism he promised to deliver.

President Trump expressed certainty his big gamble to directly assist the Israelis delivered a knockout blow to Iran's nuclear program - even as many supporters and detractors alike were warning that U.S. military action could draw the United States into an expansive regional conflict.

President Trump's bombardment of three sites in Iran quickly sparked debate in Congress over his authority to launch the strikes, with Republicans praising Trump for decisive action even as many Democrats warned he should have sought congressional approval.

One image shows President Donald Trump staring straight ahead stone-faced, monitoring the mission that took out three Iranian nuclear enrichment sites on Saturday.