New Jersey Gov. Chris Christie’s endorsement Friday of GOP presidential candidate Donald Trump was a setback to rival Sen. Marco Rubio, but only the beginning.Christie made the endorsement at a Trump campaign rally in Texas. And he’s back on the stump Saturday in Arkansas and Tennessee, where he’s expected to fulfill the role of political attack dog. The tough-talking Christie dropped out of the GOP presidential race after a poor finish in the Feb. 9 New Hampshire primaries but not before a visceral debate attack on Rubio that put the Florida senator and his campaign on the ropes.

More at Source: Beyond just endorsing Trump, Christie now attack dog in chief against Rubio | Fox News