New Delhi, Jan. 5 -- President Donald Trump's military intervention in Venezuela will pose a fresh test of his ability to hold together a restive Republican coalition during a challenging election year that could be defined by domestic concerns like health care and affordability.

While most Republicans lined up behind the president in the immediate aftermath of the stunning U.S. mission to capture Venezuelan leader Nicolas Maduro and bring him to New York to face criminal charges, there were signs of unease across the spectrum within the party. In particular, Trump's comments about the U.S. positioning itself to "run" Venezuela have raised concerns that he is abandoning the "America First" philosophy that has long distinguished him from ...