On Tuesday, Mr. Trump is expected to promote his actions and lay out his priorities in an address to Congress. He will discuss plans to end wars in Ukraine and Gaza, address the funding battle on Capitol Hill, and talk about his approach to Russia and Ukraine. The presence of Elon Musk, who has had a significant influence in the Trump administration, raises questions about the future of their relationship. Divisions among Republicans and disagreements over legislative strategy will also be in focus. Democrats, who have struggled to respond to the Trump administration, will have to decide how to voice their disapproval during the address.