He got impeached for withholding military aid to force the Ukrainian government to investigate his political opponent, but that's not a factor in this case. Br

He got impeached for withholding military aid to force the Ukrainian government to investigate his political opponent, but that's not a factor in this case. Broadly speaking, Trump claims that he has the power to tell any executive agency to not do anything under the "unitary executive" theory. Whether this holds or not is up to the courts to determine, but unless and until there is a stay, the executive agencies have to follow the EO.