US President Donald Trump speaks at the American Veterans (AMVETS) 75th National Convention in Louisville, Kentucky, the United States, Aug 21, 2019. (Photo: IC)

US President Donald Trump says he's looking "very seriously" at ending the right to citizenship for babies born to non-US citizens on American soil.

Trump spoke to reporters Wednesday as he departed the White House for a speech in Louisville.

He says birthright citizenship is "frankly ridiculous."

This isn't the first time Trump has claimed he'd do away with it — he also said something similar in October.

But the citizenship proposal would inevitably spark a longshot legal battle over whether the president can alter the long accepted understanding that the 14th Amendment grants citizenship to any child born on US soil, regardless of a parent's immigration status.