U.A.E. real estate tycoon and Trump pal has a history of audacious projects, but can he come up with the pledged $20 billion? He makes his case from Mar-a-Lago.

“We are not just entering Dubai’s real estate market ... to keep it in exchange for the illegal land transfer to Khan. Khan and Hussain have denied the accusations.

Even in the emirate of Dubai — renowned for embracing ambitious projects — many were taken aback when local tycoon Hussain Sajwani stood beside Donald Trump to pledge a $20 billion investment ...