Violent clashes erupted in the Venezuelan capital on Tuesday after opposition leader Juan Guaidó launched what appeared to be a military-backed challenge to President Nicolás Maduro, summoning thousands of people to the streets to demonstrate against the socialist leader.

US Senator Marco Rubio, who has strongly backed Guaido, issued a call for the military to rise up: “This is the moment for those military officers in #Venezuela to fulfil their constitutional oath & defend the legitimate interim President @jguaido, in this effort to restore democracy,” he tweeted. “You can write history in the hours & days ahead.”

via Clashes in Caracas after Guaido stages coup against Maduro