Nunes has refused to step down. On Friday, he was expected to deliver remarks at the annual meeting of the Ag Lenders Society of California in Fresno. The event is closed to the press but has drawn protests.
Earlier this week, Nunes was asked by reporters if he would continue leading the investigation into Russian meddling in the election.
"Why would I not," Nunes answered. "We're doing a very thorough job on this investigation."
White House Press Secretary Sean Spicer defended the committee chairman's communication with Trump officials during his daily briefing on Friday.
"What occurred in Chairman Nunes in coming here was both routine and proper," Spicer said.
Meanwhile, the president's top lawyer has invited Republican and Democratic lawmakers to view classified information at the White House.
But, to Speier, the whole affair has been a waste of time.
"Let's remember where we are. This emanated from a Saturday morning, unsupervised tweet by the president," Speier said.
Trump attributed the claim to comments he heard from an analyst on Fox News.
"For the next two weeks all that we were focused on was whether or not there was wiretapping," Speier said.
FBI Director James Comey, during a hearing before the House Intelligence Committee, said there was no evidence of such surveillance.
"At some point we have got to recognize that the president and persons within his administration and now the chair of the Intelligence Committee are willing to lie," Speier said.
Reports also surfaced Thursday that former National Security Adviser Michael Flynn was negotiating with the House and Senate intelligence committees to testify about any Trump campaign dealings with Russia after he would be given immunity from prosecution.
While committee officials have rebuffed that offer, the panels want to talk to Flynn about meetings he had with the Russian ambassador to the U.S. before Trump was inaugurated and before Flynn was legally allowed to conduct foreign policy, among other ethical issues.
Flynn must be requesting immunity because he's violated the law, according to Speier.
"This goose-chase that we've been on is preventing us from doing our work," she said. "There is a serious problem when Russia was able to intervene in our election and probably had a profound impact on it."
KQED's Brian Watt contributed to this report.