Former New York City Mayor Rudy Giuliani, an adviser for Donald Trump's campaign, renewed rumors that something is wrong with Hillary Clinton's health.

Talking to Shannon Bream on 'Fox News Sunday,' Giuliani suggested that the media was covering up 'several signs of illness' that he believed the former secretary of state was displaying.

'All you have to do is go online,' Giuliani said. 'Go online and put down "Hillary Clinton's illness." Take a look at the videos for yourself.'

Giuliani was referring to a number of right-wing conspiratorial videos that suggest the 68-year-old Clinton is plagued by a number of health problems.

Last week, Clinton's campaign began vehemently pushing back against online rumors that she is ill, using comments made by Trump to get on the topic.

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This morning on 'Fox News Sunday' former New York City Mayor Rudy Giuliani renewed rumors that something is wrong with Hillary Clinton's health

Trump had said during a national security speech that Clinton lacked the 'mental and physical stamina to take on ISIS.'

Then, during a town hall with Fox News Channel's Sean Hannity, Trump said Clinton 'doesn't really do that much. She'll give a speech on a teleprompter, and then she'll disappear.'

'I don't know if she goes home,' he said before sounding more assertive. 'She goes home and goes to sleep. I think she sleeps.'

Trump also suggested that Clinton 'takes a lot of weekends off.'

Clinton's campaign interpreted Trump's words to mean that he was peddling some of the right-wing conspiracy theories going around the internet including that Clinton had suffered a seizure on camera and that she was showing signs of dementia.

'While it is dismaying to see the Republican nominee for president push deranged conspiracy theories in a foreign policy speech, it's no longer surprising,' Clinton's communications director Jennifer Palmieri said in a statement.

The cough that she had through part of the early primary season wasn't a symptom of allergies, which she does suffer from, or talking too much, but rather a sign that the 68-year-old former secretary of state is seriously ill, the rumors go

Hillary Clinton, pictured left, had a coughing fit while giving a speech in New York in February. Pictured right, Right-wing groups claim this footage shows her 'having a seizure'

'Donald Trump is simply parroting lies based on fabricated documents promoted by Roger Stone and his right wing allies,' Palmieri continued.

She then pivoted for a moment to blast Trump for not releasing any of his tax returns to the American public.

'Hillary Clinton has released a detailed medical record showing her to be in excellent health plus her personal tax returns since 1977, while Trump has failed to provide the public with the most basic financial information disclosed by every major candidate in the last 40 years,' she acknowledged.

'It's time for him to stop using shameful distractions to hide his own record,' Palmieri added.

The Clinton campaign also pointed out in the email that 'Trump and his allies have donned tin foil hats when things weren't going his way,' pointing to the billionaire's propensity to hint that he believes a number of right-wing theories are true.

In the past, Trump gave credibility to the 'birther' movement, in which people tried to dig up proof that President Obama wasn't born in the United States.

Clinton slips as she walks up the stairs into the non-profit SC Strong, a two year residential facility that helps former felons, substance abusers, and homeless

During the Republican primary Trump tried to connect the dots between Sen. Ted Cruz's father and John F. Kennedy's assassination.

He also hinted that he believed Supreme Court Justice Antonin Scalia had been murdered, rather than dying because of poor health.

A number of right-wing websites have been pushing stories about Clinton's health.

'Leaked' medical documents portend to show that the former secretary of state is showing signs of dementia.

A video being passed around suggests she had a seizure when talking to supporters in a muffin shop in Washington, D.C. on June 10.

The cough that she had through part of the early primary season wasn't a symptom of allergies, which she does suffer from, or talking too much, but rather a sign that the 68-year-old former secretary of state is seriously ill, the rumors go.

She was also seen slipping as she walked up the stairs into the non-profit SC Strong, a two year residential facility that helps former felons, substance abusers, and homeless move into self-sufficiency on February 24 this year in North Charleston.

Clinton's people included a new statement from her physician, Dr. Lisa Bardack, who signed off on the Democrat's health in the beginning months of her campaign last year.

'As Secretary Clinton's long time physician, I released a medical statement during the campaign indicating that she is in excellent health,' Bardack said in a statement last night.

'I have recently been made aware of allegedly "leaked" medical documents regarding Secretary Clinton with my name on them. These documents are false, were not written by me and are not based on any medical facts,' she continued.

'To reiterate what I said in my previous statement, Secretary Clinton is in excellent health and fit to serve as President of the United States,' Bardack said.

There's polling data that indicates a bigger portion of Americans believe candidates should release their medical records to put to bed some of these issues, and that number has gone up since Karl Rove made comments that may have been the genesis of these persistent rumors.

Rove, a Republican strategist known best for his work for President George W. Bush, floated the idea in May 2014 that Clinton may have suffered a traumatic brain injury when she fainted in 2012 due to a stomach flu, got a concussion and later developed a blood clot.

'Thirty days in the hospital,' Rove said. 'And when she reappears, she's wearing glasses that are only for people who have traumatic brain injury?' We need to know what's up with that.'

Politifact rated Rove's claims as patently false, while Clinton's spokesman Nick Merrill pushed back on them as well, but the insinuation was now out there.