Venezuelan opposition leaders are rejecting a 60-day state of emergency declared by President Nicolas Maduro.

Maduro declared the state of emergency over the weekend, giving himself decree powers to intervene in the economy and protect national sovereignty. He said the expanded powers were needed to guard against U.S. meddling in the socialist country.

Opposition leader Henrique Capriles called the move unconstitutional Tuesday because Maduro acted unilaterally. Capriles said Venezuelans should reject the decree.

Capriles is expected to lead a march through the streets of Caracas on Wednesday to support calls for a voter referendum on whether to oust Maduro from office.

The opposition has filed a petition with enough signatures to authorize conducting a broader petition drive on holding a recall referendum. But on Tuesday, Maduro called that initiative "optional."