President Donald Trump's presence at the US Open has sparked a massive security sweep as preparations were made for a possible nerve agent threat, according to a source.
The Republican, 79, is set to attend the US Open at 2pm Sunday - the first time he's done so since 2015.
Ahead of the president's appearance, a US Open insider told the Daily Mail that nerve agents and chemical weapons were among a raft of potential threats at Flushing Meadows.
'We've been scoping out the area with our colleagues in the CIA and taking precautions in the event of an attack using chemical weapons or nerve agents,' he said.
The preparations are precautionary and are not understood to relate to any specific threat made against the commander-in-chief.
