April 8 (Reuters) - The U.S. should delay implementing

its new tariffs for up to 90 days while trade negotiations take

place, billionaire investor Bill Ackman, who endorsed Donald

Trump's run for president, said in a social media post on

Tuesday.

Ackman said that while he was supportive of tariffs, a 30-,

60- or 90-day pause would prevent "a major global economic

disruption that would harm the most vulnerable companies and

citizens of our country."

Implementing the tariffs without allowing time for

agreements will do "unnecessary harm," Ackman wrote.

Ackman is among a number of high-profile executives who have

expressed concerns over Trump's new tariff plan.

JPMorgan Chase ( JPM ) CEO Jamie Dimon and BlackRock ( BLK )

chief Larry Fink have also warned that the trade tensions could

constrain the economy.

(Reporting by Niket Nishant in Bengaluru; Editing by Anil

D'Silva)