Qatar's Emir, Sheikh Tamim bin Hamad Al Thani, met Tuesday with U.S. Senator John McCain, ahead of a summit scheduled to be held with U.S President Barack Obama and other Gulf leaders, the Saudi Press Agency (SPA) reported. During the meeting, the two men discussed bilateral relations and means to enhance them. They also spoke about regional and international matters, according to SPA. Also on Tuesday, Sheikh Tamim met with the Chairman of the Armed Forces Committee of the Senate and a number of other senators. Sheikh Tamim is expected to attend a summit with the other representatives of Gulf Cooperation Council countries. The Camp David summit is due to begin Wednesday evening with dinner at the White House and continue on Thursday at the presidential retreat at Camp David in Maryland. Obama invited the GCC nations after six world powers reached a framework agreement with Iran that would give Tehran sanctions relief for reining in its nuclear program. The American leaders aims to reassure the Gulf States that the U.S. isn't ignoring those concerns and will aid their security.