Has Trump's control over the GOP in Congress waned? It's complicated.

WASHINGTON – Republicans, led by President Donald Trump, control Congress.

Well, depending on the day.

An ever-slimming voting margin in the House of Representatives is becoming a bigger problem for the White House and House Speaker Mike Johnson. Mavericks in the Senate are increasingly voicing frustrations, too, with party leadership over issues like foreign policy and health care.

The changing political dynamics are revealing Republican divisions that threaten to derail what could be Trump's last chance to pass significant legislation if Democrats win control of at least one house of Congress in November.

To kick off the important year heading into the midterm elections, the president in the first week of January rallied GOP lawmakers at a retreat in Washington. In a speech to the crowd of House Republicans, he stressed they have "so many good nuggets," to campaign on this year. In particular, he highlighted revenue brought in from tariffs and the White House's negotiations to bring down prescription drug prices.