US President Barack Obama has fully endorsed Democratic presidential nominee Hillary Clinton’s fitness to serve as president, despite concerns over her being diagnosed with pneumonia. Obama offered his endorsement during a campaign trail in Philadelphia on Tuesday for his first solo rally on behalf of the Democratic nominee. “You want to debate who’s more fit to be our president? One candidate who’s traveled to more countries than any secretary of state ever has, has more qualifications than pretty much anyone who’s ever run for this job,” Obama said.

“She worked hard, tirelessly flying around the world again and again, I don’t know how many times she lapped the world but she did it a long time,” the president added, stressing Clinton’s stamina to serve in the White House. Obama also took a swipe at the Republican presidential nominee Donald Trump, saying the New York businessman “isn’t fit in any way shape or form to represent this country abroad and be its commander in chief.”

He slammed Trump and his fellow Republicans for depicting a “dark, pessimistic vision” of the US during the campaign rallies. “They’re not offering serious solutions,” Obama noted. “They’re just fanning resentment and blame and anger and hate.”

The remarks were made as rumors about the 68-year-old former first lady’s well-being have been haunting her with a video released Sunday showing a seemingly fainting Clinton stumbling on the sidewalk after leaving a 9/11 memorial ceremony.

Upon pneumonia diagnosis, the Democratic nominee’s campaign has announced that after several cancelled fundraising trips and campaign events, Clinton is scheduled to appear at a “black women’s agenda” in a few days.

This is while Trump has repeatedly questioned his rival’s health, saying she is physically unfit to serve as president.

According to the NBC News/Survey Monkey tracking survey released on Tuesday, Clinton is trailed by Trump by only 4 percentage points, 48 to 44 percent, among registered voters. The NBC poll also shows that a majority of registered voters hold an unfavorable view of both Trump and Clinton, and consider them untrustworthy.

The former secretary of state is viewed negatively by 59 percent of voters and the New York billionaire by 60 percent. Thirty-eight percent have a favorable impression of Trump while 39 percent have a favorable impression of Clinton. The poll was conducted from September 5 to 11 among a national sample of 16,220 registered voters. The margin of error is 1.1 percentage points.

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