Atlanta Fed President Dennis Lockhart said in an interview with Bloomberg Television on Monday that the Fed should wait until July before raising its interest rates further, noting that the U.S. weak labour market data for May and the referendum on Britain's membership in the European Union may weigh on the interest rate decision in June.

Atlanta Fed president also said that he expected two interest rate hikes this year.

Lockhart is not a voting member of the Federal Open Market Committee (FOMC) this year.