Republican in name only

In US politics, "Republican in name only" is a pejorative used to describe politicians of the Republican Party deemed insufficiently loyal to the party, or misaligned with the party's ideology. Similar terms have been used since the early 1900s. The acronym RINO became popular in the 1990s, and both the acronym and the full spelling have become commonly used by sitting President Donald Trump and his supporters to refer to his critics within the Republican Party.