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- Rep. John James wants to bar anyone over the age of 75 from serving in Congress or the White House.
- But James has endorsed Trump, who's currently 77, despite once saying he's "not fit to lead."
- Imposing an age limit would require amending the US Constitution, a long and difficult process.
Republican Rep. John James of Michigan is proposing an amendment to the US Constitution that would effectively bar anyone over 75 from serving in Congress or as President of the United States.