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By Liz Johnstone and Jeremia Kimelman

For months, dozens of potential challengers to President Donald Trump have been “taking a look at,” “thinking about” and “not ruling out” a White House bid. Right now, the field is crowded with potential would-be candidates who haven’t said one way or another whether they’ll actually run. Some, however, have formally declared their candidacies while others have launched exploratory committees. It's expected as many as 20 contenders could ultimately dive in, making for a crowded race.

Here’s a timeline of the ever-expanding field, with slash marks denoting rumored candidates who took themselves out of the running.

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