"The fact that she's coming to give us a week of her time — she could be doing anything — is a testament to the show that we have built," Bush Hager exclusively tells PEOPLE

Christina Haack is publicly feuding with her estranged husband, Josh Hall, after the release of the latest preview for HGTV’s The Flip Off, in which they both star. Hall took to social media to share an article about a promo for the competition series that showed the couple during a tense moment before they called it quits …