Rep. Adam Schiff Adam Bennett SchiffOvernight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings Democrats, advocates seethe over Florida voting rights ruling MORE (D-Calif.) on Sunday fired back after the White House called for an investigation into alleged wiretapping of Trump Tower, saying that even press secretary Sean Spicer does not want to speak about President Trump’s accusation.

“Sean Spicer today tweeted that the administration would have no further comment until this matter was investigated and who can blame him: not even Spicer wishes to have to speak to such an unsubstantiated claim,” Schiff said in a statement, as reported by ABC News.

Spicer said Sunday morning that Trump is calling on Congress to “determine whether executive branch investigative powers were abused in 2016,” as part of its investigation into Russia’s interference in the presidential election.

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Trump on Saturday accused former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE of wiretapping Trump Tower before Election Day, but did not provide any evidence of the claim. Obama, through a spokesman, denied that he or any White House official ordered wiretapping.

Schiff in his latest statement slammed Trump over previous unfounded claims, including that widespread voter fraud caused him to lose the popular vote to Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE.

Schiff, who serves as the ranking member on the House Intelligence Committee, urged the Trump administration to support his call for FBI Director James Comey to answer questions related to Russia’s activities.

“If the administration truly believes President Obama illegally eavesdropped on the Trump campaign and wants our committee to investigate the matter, they should join my call on Director Comey to answer any question put to him that is pertinent to the Russia investigation,” he said.