Rep. Liz Cheney is using her platform on the special committee investigating the Jan. 6 attack to take direct aim at Donald Trump — and become a foil to the former president and de facto leader of the GOP. Since she led a band of 10 Republicans to impeach Trump for his role in inciting the Capitol riot, the Wyoming Republican and political scion has become the public face of the anti-Trump GOP movement. But her new role as the vice chair of the Jan. 6 panel — one she owes to Speaker Nancy Pelosi (D-Calif.) and Chairman Bennie Thompson...