Three key US Senators have asked Pakistan to take steps to eliminate terrorist safe havens in the country, if Islamabad wanted a closer relationship with the US. The senators charged that Pakistan was not taking action against militants of the Haqqani group and Quetta Shura which were posing a greater threat than ever. The Senators Carl Levin, Jeanne Shaheen and Jeff Merkley in a joint statement after their return from a trip to Pakistan said, these safe havens allow those insurgents to cross the border to attack US, Afghan and coalition forces and then return to their sanctuaries.