None of this should be all that surprising.
Check it out:

President and First Lady Bill and Hillary Clinton enjoyed a friendly relationship in office with the chairman of a mosque that counted 9/11 hijackers as worshippers and invited controversial Muslim Brotherhood-linked television preacher Yusuf al-Qaradawi in for a meeting.

The Daily Caller recently reported that Bill Clinton sent a handwritten note on official stationery in March 2000 to Bassam Erstwani, the chairman of the board of the Dar Al-Hijrah Mosque in Falls Church, Virginia, in response to a letter from the chairman. Clinton’s note was released as part of a document dump by the Clinton presidential library.

The note was marked “THE PRESIDENT HAS SEEN 3-10-00.”