WASHINGTON (Reuters) -- Concern ‌about high inflation mounted at the US central bank's meeting last month, as officials followed Federal Reserve Chairman Kevin Warsh's lead to a more stripped-down policy statement even amid concerns that price increases were broadening and might require interest rate hikes. A "few participants" at the June 16-17 meeting said there was already a case to raise borrowing costs, even though ‌they ultimately agreed with their colleagues to hold rates steady "at this