Cher has backed a campaign urging bosses of Macy's department store to sever ties with business mogul Donald Trump over his political views.

The singer is one of 400,000 customers who have signed the 'Dump Trump' petition posted on Signon.org, which aims to convince store chiefs to distance themselves from The Apprentice star over his recent criticism of newly re-elected President Barack Obama.

Trump features in the store's new Christmas advertising campaign, and he also sells his own clothing range and fragrances at Macy's, and Cher is adamant she will boycott the shop until Trump is dumped.

She writes in a series of posts on Twitter.com, "I'll never go to Macy's again! I didn't know they sold Donald Trump's line! If they don't care that they sell products from a loudmouth racist cretin, who'd lie like 'his rug' to get some cheap press! I can't believe Macy's thinks he's the right 'man' 2 represent their name!"

Trump's spokesman Michael Cohen tells the New York Daily News, "Mr. Trump is important to Macy's, both as a brand and as an endorser. His ties, shirts, cufflinks, fragrances and other merchandise are top-selling items across the country..."

"The country has been founded on the principles of freedom of speech - something Mr. Trump is entitled to as well as the creator of this petition."