the alien is described in subclause (I), (II), (III), (IV), or (VI) of section 212(a)(3)(B)(i) or section 237(a)(4)(B) of the Immigration and Nationality Act (
8 U.S.C. 1101 et seq.) (relating to terrorist activity), unless, in the case only of an alien inadmissible under subclause (IV) of section 212(a)(3)(B)(i) of such Act, the Secretary of Homeland Security determines, in the Secretary's discretion, that there are not reasonable grounds for regarding the alien as a danger to the security of the United States; or