Hillary Clinton would find herself in a close race with several of the Republicans running for president, but at the moment she wouldn't win.

That is the finding of a Fox News poll released Friday, which found her trailing three out of four GOP presidential candidates she was tested against and leading none of them.

Florida Sen. Marco Rubio is ahead of the former secretary of state by the biggest margin, 50 percent to 41 percent. Texas Sen. Ted Cruz would also win 50 percent of the vote against Clinton, but she takes 43 percent in that hypothetical matchup.

Billionaire Donald Trump would edge Clinton with 47 percent to her 44 percent. Former Florida Gov. Jeb Bush and Clinton would be tied at 44 percent apiece.

Of these four Republicans, Bush performs the worst in state and national polls of Republican primary voters. This Fox News result may be a partial explanation: establishment candidates are generally seen as having electability advantages over conservative and populist alternatives in the general election. Bush is competitive with Clinton, but doesn't do as well against her as Rubio, Cruz or even Trump.