BOSTON (CBS/AP) – Mitt Romney says he thinks there’s a “bombshell” in Donald Trump’s tax returns.

The 2012 Republican presidential nominee said on Fox News Wednesday that the contents of Trump’s tax returns are the reason the billionaire developer has not released them.

Trump has said his accountants are working on his returns and that he’ll release them eventually.

Romney is also calling on Marco Rubio and Ted Cruz to release their tax returns.

On Wednesday night, Trump responded to Romney’s accusations on Twitter.

“Mitt Romney, who totally blew an election that should have been won and whose tax returns made him look like a fool, is now playing tough guy,” Trump tweeted.

The former Massachusetts governor came under intense scrutiny in 2012 over his own tax filings.

Romney also says he believes Trump has the clearest path to the Republican nomination and that there is “a slimmer and slimmer opening” for his rivals unless the field narrows.

(TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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