Dionne Warwick's "Bad Attitude"

Donald Trump, the billionaire tycoon-turned-reality TV star, has spoken out about his decision to fire soul star Dionne Warwick from U.S. show The Celebrity Apprentice, insisting the  70-year-old soul singer had a bad attitude.

Warwick's taped departure from the show aired on Sunday night and Trump admits he had no problems asking her to leave.

Speaking to Access Hollywood, he said: "Dionne Warwick had attitude and at some point everybody in the room got tired of the attitude."

"She just felt she was superior to the other people in the cast and I don't think they liked that."

According to Forbes, the 64-year-old real estate tycoon has a net worth of $2.7 billion (£1.7 billion). He became the boss of the US version of The Apprentice in 2003.