The Latest on Venezuela's political crisis (all times local):

11:45 a.m.

Masses of Venezuelans are donning white and taking to the streets to demand the end of the socialist administration that opposition leaders say has become a dictatorship.

Some schools and shops are shut in Caracas and ahead of an expected major rally in the capital. Opposition figures say turnout is expected to rival a Sept. 1 rally that drew hundreds of thousands into the street to demand that a recall campaign against President Nicolas Maduro be allowed to proceed.

Authorities suspended that recall effort last week, citing allegations of fraud in early stages of signature gathering. That effectively ended the opposition's chances of ousting Maduro through democratic means, and has led to an escalating political crisis.

On Tuesday, the opposition-controlled congress opened a political trial against Maduro for breaking the constitutional order.