The Republican Party is in danger of splitting apart, former Clinton advisor Sidney Blumenthal said Thursday.
"I think that the Republican Party is in danger of going the way of the Whigs," he said, referring to the 19th century political party whose members split to form today's Republican Party and the defunct Know Nothing Party.
"Parties do break up. They do disintegrate. They disappear, and they become something else," he told CNBC's "Squawk Box".
Presumptive Republican presidential candidate Donald Trump is meeting with GOP House Speaker Paul Ryan on Thursday following an exchange last week in which Ryan said he was not yet ready to support Trump. Trump fired back that he was not ready to support Ryan's agenda.