NEW JERSEY -- On Thursday, President Trump will mark six months in office with the lowest approval rating of any president going back 70 years.

A new national poll out Sunday shows just 36 percent of Americans approve of Mr. Trump's job performance so far.

Mr. Trump's disapproval rating has jumped to 58 percent.

Meanwhile, Mr. Trump shrugged off the poor grades with a tweet that read: "The ABC/Washington Post Poll, even though almost 40% is not bad at this time, was just about the most inaccurate poll around election time!"

The ABC/Washington Post Poll, even though almost 40% is not bad at this time, was just about the most inaccurate poll around election time! — Donald J. Trump (@realDonaldTrump) July 16, 2017

Protesters opposed to the U.S. Women's Open being held at Mr. Trump's golf course, took their message the roads of Bedminster, New Jersey, this weekend.

But, Sunday morning, Mr. Trump thanked his supporters and accused so-called fake news media of scorning his son.

Thank you to all of the supporters, who far out-numbered the protesters, yesterday at the Women's U.S. Open. Very cool! — Donald J. Trump (@realDonaldTrump) July 16, 2017

Donald Trump Jr.'s meeting at Trump Tower last year, which included top campaign staff and Russians linked to the Kremlin, is being scrutinized in Washington.

Vice chair of the Senate Intelligence Committee, Senator Mark Warner, spoke to CBS' "Face the Nation" on Sunday.

"Very troubling. And obviously moves our whole investigation to another level," Senator Warner said on the Trump Jr. revelation.

"I want to hear from everyone in that meeting and get their version of the story," Warner said. "What we've seen is a constant effort to hide contacts with Russians. We've seen this pattern repeat itself."

Mr. Trump was also dealt a setback this weekend on his wish to repeal Obamacare.

Senate Majority Leader Mitch McConnell delayed an upcoming vote on the Senate bill while John McCain recovers from emergency surgery to remove a blood clot above his left eye.

The Better Care Act needs almost unanimous GOP support, which it does not yet have.

"For all Republicans' complaints about the death spiral of Obamacare, they don't fix it, they simply subsidize it with taxpayer monies, which I just don't agree with at all," Senator Rand Paul said on "Face the Nation."

"This bill would make sweeping and deep cuts in the Medicaid program, which has been a safety net program on the books for more than 50 years," Senator Susan Collins said on ABC's "This Week."

Mr. Trump did get some good news Sunday from a Washington Post / ABC News poll, which found more Americans agree with his handling of the economy than disagree. However, 48 percent "disapprove strongly" of his performance overall, a level never reached by his two Democratic predecessors.