An Invoke volunteer has reportedly been arrested by Johor police in relation to Putrajaya's alleged hiring of a US lobbyist, said Invoke coordinator Rafizi Ramli.

Rafizi said the volunteer, Gerald Tang, had assisted the NGO in confirming the business address of Florence Goh, who is the alleged director of Godfrey Group Ltd - the firm allegedly involved in engaging the lobbyist.

"Tang had received calls from the police since last week. Today he came to give a statement at the Seri Alam district police headquarters...