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There are fresh concerns over Donald Trump's health after he displayed a bizarre mannerism during a speech in Washington.

The US President used a moment of applause to take a swig from a glass of water he had been keeping by the side of his lecturn.

But viewers were baffled when he used both hands to drink from the small tumbler glass - with some pointing out that he used the same technique a toddler might use.

One wrote: "Trump reinvents the act of drinking water every time he does it."

Another compared Trump's drinking style to that of Obama's, and described the current President as drinking "like a four-year-old from a sippy cup."

(Image: Getty Images North America) (Image: AFP)

A third even suggested that his issues stemmed from the fact his hands were just too small to hold the glass.

But while some made jokes about Trump's weird habit, others were concerned that it is another sign that the 71-year-old's health is at risk.

Barbara Jones wrote: "Anyone considered A. Loss of strength, B. Impaired range of motion, or C. Compensating for tremors?"

Tom Joseph added: "With today's speech, anyone can clearly see Trump's crumbling health.

"Slurring, sippy cup-style water drinking, involuntary jerks & restricted eye movements on display - part of his dozen+ symptoms of Frontotemporal Dementia.

"It's degenerative, highly progressive & worsening every week."

(Image: Barcroft Media)

Earlier this month, the President appeared to slur his words during a major speech , where he officially recognised Jerusalem as the capital city of Israel.

Trump seemed to have trouble pronouncing 's' sounds towards the end of his speech.

It led to a bizarre moment as he finished his address, where he said: "Thank you. God blesh you. God blesh the Israelis. God blesh the Palestinians and God blesh the United Shtates."

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Another passage the President appeared to struggle with read: “And finally I ask the leaders of the region, political and religious, Israeli and Palestinian, Jewish and Christian and Muslim to join us in the noble quest for lasting peace.”

But a White House spokesman insisted the President had a case of 'dry mouth', telling the Los Angeles Times: "His throat was dry. There's nothing to it."

And in November, his awkward sip of water during a speech on his return from Asia sent social media into a frenzy.

(Image: AFP) (Image: REX/Shutterstock)

Again, the President grasped the bottle with both hands before taking a swig, using his whole body.

Ironically, Senator Marco Rubio was mercilessly mocked by Trump during the 2016 presidential campaign for his water bottle gaffe during a speech years earlier.

Trump ridiculed Rubio over an incident back in 2013, years before the billionaire businessman expressed any political aspirations.

Rubio was giving the GOP response to Barack Obama's State of the Union address when he paused to reach for a water bottle while keeping his eye on the camera.

Trump tweeted in response: "Next time Marco Rubio should drink his water from a glass as opposed to a bottle—would have much less negative impact."

(Image: Reuters)

He continued to mock Rubio over the gaffe on the campaign trail, repeatedly tweeting about it and even mimicking his water drinking while on stage in Fort Worth, Texas.

On November 9, 2015, Trump tweeted: "Marco Rubio couldn't even respond properly to President Obama's State of the Union Speech without pouring sweat & chugging water. He choked!"

Trump was giving his latest speech in Washington yesterday, as he unveiled his national security strategy in front of military service members.