What arguably had been the quietest dispute in Washington, D.C., ramped up a bit today when Senate Majority Leader Harry Reid challenged freshman Sen. Marco Rubio’s political approach and questioned his constituency.

The Florida Republican obviously has rankled the Nevada Democrat with his tack of fighting President Barack Obama’s policy on Latin America by blocking diplomatic appointments, Politico reports. The Spanish-language media generally have been the only ones covering the spat.

The dust-up started last year, when Rubio challenged the White House on its selection of Mari Carmen Aponte for ambassador to El Salvador. He acted to force the State Department to take a stronger stance against authoritarian regimes in Nicaragua and Cuba.