Donald Trump's 2016 opponents are already denouncing his proposal to ban Muslims from entering the U.S.

On Monday, Republican presidential hopeful Donald Trump called for a "complete shutdown" of Muslims entering the U.S. for any reason. It didn't take long for his 2016 opponents to start denouncing that idea:

One of the first to do so was another Republican, New Jersey Gov. Chris Christie:

Democratic longshot Martin O'Malley was quick to label Trump as "fascist."

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Sen. Lindsey Graham (R-S.C.) called Trump "downright dangerous."

Former Gov. Jeb Bush (R-Fla.) said the billionaire business mogul is "unhinged":

Here's another Republican presidential hopeful, Carly Fiorina, weighing in:

Sen. Ted Cruz (R-Texas) had a less forceful reaction, but still a negative one:

Hillary Clinton called Trump's statement "reprehensible."

Sen. Bernie Sanders (I-Vt.), Clinton's closest competition for the Democratic nomination, cautioned Americans against "allowing racism and xenophobia to divide us."

Gov. John Kasich (R-Ohio) joined in, calling Trump "entirely unsuited to lead the United States."

Sen. Marco Rubio (R-Fla.) shared that he found the "outlandish" remarks to be divisive.

Finally, former New York Gov. George Pataki (R) jumped into the fray and called Trump's comments "idiotic."

Editor's note: This post has been updated to reflect new reactions from candidates.