Donald Trump, the kind of man who never saw an opportunity to appear in print or on television that he didn't love even more than Marla Maples, skipped out on a big one yesterday at the American Booksellers Association convention in Las Vegas. The room was packed with reporters and a few television cameras for a breakfast with authors Trump, Angela Lansbury and T. Coraghessan Boyle. Trump spoke about his book "Trump: Surviving at the Top," but didn't stay for the scheduled press conference.

When one reporter asked about his absence, a spokeswoman said, "He had to leave. I'm sorry." There was speculation that Trump's survival at the top is in jeopardy and he didn't want to face any difficult questions in connection with news reports that the high-living developer's cash shortage is so severe he may have to change his lifestyle, as well as sell off some of his holdings.

Out and About

Former hostage Robert Polhill celebrated his release from Walter Reed Army Medical Center Thursday by going out Friday to get his hair cut at the fancy Georgetown salon Okyo, followed by dinner at Primi Piatti. Polhill observed his 56th birthday Sunday ...

Hospital Report: Superstar Michael Jackson underwent diagnostic tests yesterday at St. John's Hospital in Santa Monica, Calif., and was resting comfortably in good condition, according to cardiologist Mark Zatzkis. Jackson entered the emergency room Sunday night complaining of chest pains. The 31-year-old star reportedly began feeling the discomfort while he was doing some dance exercises. According to Bob Jones of his production company, MJJ Productions, "Evidently he must have had a little pass-out, then he contacted his physician." Lee Solters, the 31-year-old star's spokesman, said Jackson has no history of heart problems. LaToya Jackson, in an interview with Associated Press from London, said her brother has had similar chest pains in the past that required hospitalization and that his doctor blamed the attacks on stress. Jackson is just down the hall from actress Liz Taylor, still recovering from a near-fatal case of pneumonia, and he received a get-well telephone call yesterday from President Bush, Jones said ...

If former heavyweight boxing champ Mike Tyson doesn't pay towing and storage fees in the amount of $126, he stands to lose his $85,000 car. Tyson's 1990 gold Mercedes-Benz 500SL convertible with car phone and leather interior has been sitting in a Hudson, N.Y., car pound since May 2, when he was arrested for driving it without license plates and a registration. If Tyson doesn't come in and pay, the car is scheduled to be placed on the auction block later this month ...

There were two odd omissions at Sunday night's Tony Awards show: There was no mention of the death Saturday of one of Broadway's best-known stars, Rex Harrison, and no one mentioned that "A Chorus Line," the White Way's longest-running show, closed its doors April 28 ...