; and (C) effectively implementing and enforcing policies and procedures on the appropriate use of travel funds, including restrictions on first class and business class travel. (2) Waiver The restrictions imposed by or pursuant to paragraph (1) may be waived on a case-by-case basis if the Secretary of State determines and reports to the Committees on Appropriations that such waiver is necessary to prevent or respond to a humanitarian crisis. (b) Restrictions on United Nations Delegations and Organizations (1) Restrictions on united states delegations None of the funds made available by this Act may be used to pay expenses for any United States delegation to any specialized agency, body, or commission of the United Nations if such agency, body, or commission is chaired or presided over by a country, the government of which the Secretary of State has determined, for purposes of section 6(j)(1) of the Export Administration Act of 1979 as continued in effect pursuant to the International Emergency Economic Powers Act ( 50 U.S.C. App. 2405(j)(1) ), supports international terrorism. (2) Restrictions on contributions None of the funds made available by this Act may be used by the Secretary of State as a contribution to any organization, agency, commission, or program within the United Nations system if such organization, agency, commission, or program is chaired or presided over by a country the government of which the Secretary of State has determined, for purposes of section 620A of the Foreign Assistance Act of 1961, section 40 of the Arms Export Control Act, section 6(j)(1) of the Export Administration Act of 1979, or any other provision of law, is a government that has repeatedly provided support for acts of international terrorism. (3) Waiver The Secretary of State may waive the restriction in this subsection if the Secretary determines and reports to the Committees on Appropriations that to do so is in the national interest of the United States, including a description of the national interest served. (c) United