President Donald Trump speaks during a meeting with Malaysian Prime Minister Najib Razak in the Cabinet Room of the White House, Tuesday, Sept. 12, 2017, in Washington. Candidates are seeking to make GOP primaries a referendum on support for the president.
President Donald Trump speaks during a meeting with Malaysian Prime Minister Najib Razak in the Cabinet Room of the White House, Tuesday, Sept. 12, 2017, in Washington. Candidates are seeking to make GOP primaries a referendum on support for the president. Alex Brandon AP
President Donald Trump speaks during a meeting with Malaysian Prime Minister Najib Razak in the Cabinet Room of the White House, Tuesday, Sept. 12, 2017, in Washington. Candidates are seeking to make GOP primaries a referendum on support for the president. Alex Brandon AP

Trump loyalty test will shape GOP’s 2018 House races

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