NBC producer Kristen Welker has reported that the US Secret Service has revoked the top secret security clearances of all 11 agents and officers.
"Pending investigation, their top secret clearance has been revoked," George Ogilvie, a Secret Service spokesman, said.
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Engineering firm CH2M won the £170 million contract but have pulled out of phase two of the project over alleged conflicts of interest.
The bronze bust unveiled at Madeira airport has been slammed as "horrifying", "appalling" and "awful" on social media.
The Duke of Cambridge also laid a wreath in memory of the brave policeman who was killed in last week's terror attack in London.