Donald Trump is a disgrace and should pull out of the United States presidential race, chairman of Kingdom Holding Company Prince Alwaleed Bin Talal tweeted late on Friday. "@realDonaldTrump You are a disgrace not only to the GOP but to all America," Alwaleed said on his official Twitter account, @Alwaleed_Talal. "Withdraw from the US presidential race as you will never win." A statement early Saturday from Alwaleed's office said his tweet was in response to Trump's "anti-Islam statement." Trump, the frontrunner for the Republican nomination, has been lambasted both in the US and abroad for his proposal made on Monday to temporarily bar Muslims from entering the US. On Friday, protesters disrupted Trump's speech at a $1,000-a-plate New York City luncheon. Four protesters chanting "Trump is trying to bring us down, targeting people black and brown," tried to storm a side entrance into the speech at Manhattan's The Plaza Hotel as security staff pushed them away. Later in Trump's speech, about nine other protesters from various advocacy groups stood up to denounce his recent comments to temporarily bar Muslims from entering the US. "I'm really frightened by that kind of rhetoric," said Martha Acklesberg, 69, a member of the group Jews for Racial and Economic Justice, who along with Judith Plaskow, 68, paid to hear Trump speech and then disrupted it in protest. In Dubai, Trump's image and name were removed from parts of a golf course and housing development. The disappearance of at least some Trump branding from the multi-billion-dollar development on the outskirts of Dubai comes as concerns over his comments grow in the Middle East, a region in which the businessman long has sought money-making opportunities. The company behind the Trump Towers in Istanbul, meanwhile, said it is "assessing" its partnership with the Republican presidential front-runner. In Dubai, Trump had a deal with Damac Properties to license his name and image for a housing project and two golf courses for an undisclosed sum. On Friday, a prominent advertising billboard showing Trump golfing that had stood at the Akoya development, where the housing and one of the golf courses is being built, was gone. All that remained of it was the board's brown wooden background. Another billboard declaring the development "The Beverly Hills of Dubai" still stood nearby. Trump's name also appeared to have been pulled off one sign greeting visitors to the complex. The sign, outside a sales office at the site, originally had Trump's name in lettering on a stone wall. But on Friday the letters were littering the ground in front of it. — Agencies