Peru's biggest opposition party released audio and video recordings late on Tuesday in which supporters of President Pedro Pablo Kuczynski appear to offer lawmakers public works projects in exchange for help defeating an impeachment motion.

In a news conference two days before Congress votes on whether to force Kuczynski from office, the spokesman of right-wing party Popular Force said the snippets of surreptitious recordings of lawmakers and a government official shown to journalists were proof Kuczynski was trying to "buy" votes.

"We're outraged," Daniel Salaverry said, flanked by other members of his party as they renewed calls for Kuczynski to step down.