Sean Parry, 44, will appear in Westminster Magistrates' Court on Saturday following the incident on Wednesday.

He was also charged with impersonating a police officer.

The police said an investigation was launched after a member of the House of Commons made a report to the parliamentary liaison and investigation team on Wednesday 14 June following "an incident involving the MP and another man in the Westminster area earlier that day".

A Metropolitan Police spokesperson said: "Fast-time enquiries were carried out and officers on deployment in Westminster on Thursday, 15 June identified and arrested a man in connection with the incident.

"He was taken into police custody and charged on Friday 16 June."

Chief Superintendent Elisabeth Chapple, who leads the Met's Parliamentary and Diplomatic Protection Command, said: "We take the safety and security of MPs extremely seriously and our officers have acted swiftly to identify, arrest and charge a man in relation to this incident after it was reported to us. I'd like to thank the teams involved for their fast action and hard work on this case.

"More broadly, we continue to work with MPs and their offices, the parliamentary security department and with local police forces through the Operation Bridger network to provide MPs and their staff safety and security advice."

Parry will remain in custody until his court appearance.

The incident comes after a man was charged with assaulting former Health Secretary Matt Hancock following an incident at Westminster Station in January.