A pair of senior federal law enforcement figures declined to appear before a Senate subcommittee hearing led by Sen. Ted Cruz (R-Texas) on Tuesday attacking the Obama administration for its stance on "radical Islam."

The Senate Judiciary oversight subcommittee had advertised testimony from both John Carlin, head of the Justice Department's national security division, and Michael Steinbach, executive assistant director of the FBI's national security branch.

But both declined the invitation in recent days, in what Cruz described as a refusal to discuss the administration's "purging" of references to Islam.

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