regarding inter-pary challenges

[nervsov]

Has it ever occurred in American history that a U.S. President was challenged by a member of his own party, during his first term of office, for the Presidential nomination?

[tsquare]

Has it ever occurred in American history that a U.S. President was challenged by a member of his own party, during his first term of office, for the Presidential nomination?

Yes, several times, the most recent oneI recall being in 1980 when Teddy Kennedy challenged Jimmy Carter.

Franklin Pierce (1853–1857) was not renominated by the Democrats to run in the 1856 presidential election and was replaced by James Buchanan.

[nervsov]

Many thanks tsquare