By Kanishka Singh, Erin Banco and Jonathan Landay WASHINGTON, Oct 13 (Reuters) - President Donald Trump said on Monday he did not believe that China and Russia were helping Iran "at all," even as US intelligence reports in recent months have found that both countries directly support Tehran's war effort.

US President Donald Trump said on Monday that he does not believe that China and Russia are helping Iran, adding that they have "too much to lose."

Perhaps Moscow and Beijing have backed off under intensifying pressure from Washington, which has largely taken the form, publicly at least, of the threat of punishing economic sanctions.