LIMA, Nov 5 (Reuters) - Thousands of people took to the streets across Peru on Saturday to demand the resignation of embattled President Pedro Castillo, a leftist whose government is under investigation for corruption.Opposition legislators are seeking a fresh trial against the president even though Congress recognized it would not gather sufficient votes."We see a government involved in corruption and Congress doesn't react," said Lucas Ghersi, a conservative lawyer who is one of the organizers of the march, called Peru Reacts.In October, Peru's attorney general filed a constitutional complaint against Castillo with Congress that the right-wing opposition hopes will end in his removal from office.Similar protests were held in other cities across the country, including Arequipa, Chiclayo, Cusco and Trujillo, according to reports and images broadcast by local television channel Canal N.Our Standards: The Thomson Reuters Trust Principles."