The Trump administration said Thursday it will not defend key parts of the Affordable Care Act, as a number of states, led by Texas, challenge the constitutionality of President Obama’s signature healthcare law. In court filings, Justice Department lawyers sided with the Republican-led effort to overturn the ACA, in a move that would allow insurance companies to charge more or refuse coverage to people with pre-existing medical conditions. This came as the White House lobbied Republican congressional leaders to vote down a bipartisan bill that would fully fund an expansion of veterans’ healthcare that Trump signed into law on Wednesday.