Venezuela's opposition called Tuesday for the "largest movement that has ever existed" to oust President Nicolas Maduro, vowing to pursue all means to force him from power, including a referendum, a constitutional amendment and protests.

The opposition, which has been on a collision course with Maduro since winning control of the legislature in December, "has taken the unanimous decision to call on the Venezuelan people to launch the largest popular pressure movement that has ever existed, to activate all -- I repeat, all -- mechanisms for change," said opposition leader Jesus Torrealba.