A full-out battle between Rosie O'Donnell and Barbara Walters has broken out at "The View" over the Donald and his Rosie-bashing.

Rosie lashed out at boss Babwa yesterday morning in a pre-show dressing-room *****-off, calling her "a [bleeping] liar," according to Page Six, and was furious with Walters for not sticking up for her during the Rosie-Trump feud of the last two weeks.

When Walters saw Rosie yesterday morning, a couple of hours before "The View" aired, she tried to hug Ro – but Rosie, who'd been on vacation over the holidays, wouldn't touch her. And, according to the Post, she fumed, "You didn't call me for 10 g**damn days ... You never called [Donald] a liar."

Then, on yesterday's show, Babwa proceeded to brand Trump as such, which prompted the Donald to tell 'EXTRA,' "Barbara lied, as she knows very well." Rosie and Walters' rep says it was "hardly a squabble" and that everyone has "moved on."