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 reportedly "rolled his eyes" after learning of President Trump's claims last weekend that his predecessor had wiretapped Trump Tower before the election.

Obama thinks the president's claims, presented without evidence, "undermine the integrity of the office," a source close to him told NBC News.

But the source said Obama "is much more concerned by President Trump kicking people off health insurance, not staffing the government, not being prepared for a crisis, rolling back regulations so that corporations can pollute the air and water and letting mentally unstable people buy guns with no problems whatsoever."

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"He cares about all those things much more than what President Trump tweets at the TV each morning," the source told NBC News.

President Trump last weekend fired off tweets accusing the former president of wiretapping Trump Tower before Trump's presidential victory.

“Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory. Nothing found. This is McCarthyism!” Trump first tweeted on Saturday. Trump and his team have stood by the remarks but haven't presented any proof.

A spokesman for Obama later responded.