(L/R) US Senate Majority Leader John Thune, Republican from South Dakota, walks with Senator Lindsey Graham, Republican from South Carolina, on their way to the Senate Chamber at the US Capitol in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)

(L/R) US Senate Majority Leader John Thune, Republican from South Dakota, walks with Senator Lindsey Graham, Republican from South Carolina, on their way to the Senate Chamber at the US Capitol in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)

Speaker of the House Mike Johnson arrives for an early-morning meeting with fellow Republicans at the Capitol in Washington, Wednesday, June 3, 2026. (AP Photo/J. Scott Applewhite)

Speaker of the House Mike Johnson, R-La., joined by GOP leaders, prepares to talk to reporters at the Capitol in Washington, Wednesday, June 3, 2026. (AP Photo/J. Scott Applewhite)

A view of the US Capitol in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)

People walk outside the US Capitol in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)

A view of the US Capitol dome in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)

A view of the US Capitol dome in Washington, DC, on June 4, 2026. President Donald Trump's agenda faces a series of tests in the US Senate on Thursday, as lawmakers began a marathon amendment process on a $70 billion immigration enforcement bill after weeks of Republican anxiety over some of his most contentious policy moves. (Photo by Kent NISHIMURA / AFP via Getty Images)