The fight has pitted the GOP's top tax writer against a determined bloc of House Republicans from high-tax states. It has also created divisions between the pro-SALT Republicans.

A Michigan congressman is charging ahead — largely without support from his own party — in his attempt to impeach President Donald Trump, a move that comes as the congressman faces political trouble at home.

At first glance, the Republican Party in the U.S. Congress seems to march in unison defending Donald Trump's policies. However, beneath this facade of unity, there are cracks and tensions suggesting a more complex reality.