Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) on Monday criticized President Trump for his claims that 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 wiretapped Trump Tower before the election.

"President Trump cannot continue to lie, lie, lie," Sanders tweeted Monday. "It diminishes the office of the president and our standing in the world."

President Trump cannot continue to lie, lie, lie. It diminishes the office of the president and our standing in the world. https://t.co/V8cRvX4ttv — Bernie Sanders (@SenSanders) March 6, 2017

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On Saturday morning, the president, citing no evidence, claimed Obama had his phones tapped in Trump Tower before his presidential victory.

Trump questioned whether it was legal for a sitting president to be "'wire tapping' a race for president prior to an election."

"How low has President Obama gone to tapp my phones during the very sacred election process," the president tweeted Saturday. "This is Nixon/Watergate. Bad (or sick) guy!"

FBI Director James Comey asked the Justice Department to publicly reject Trump's claims, according to a New York Times report.

White House press secretary Sean Spicer on Sunday called the reports about "potentially politically motivated investigations" before the 2016 presidential election "very troubling."