WASHINGTON — Republican Sens. Marco Rubio of Florida and John McCain of Arizona are turning toward the general election with GOP control of the Senate at risk. Each is facing lesser-known Democratic House members who’ve sought to link them to Donald Trump.

Rubio and McCain have two tough months of campaigning ahead. On Tuesday they easily dispatched their Republican primary opponents. Those outcomes underscore the party establishment’s dominance of House and Senate primaries this year despite the nation’s turbulent anti-establishment mood and Trump’s outsider presidential campaign.

Not a single senator of either party has lost a primary this year. In House races, only five incumbents have lost, in most cases because they were under indictment or their districts were redrawn.