We have 3 equal branches of government. One half of one branch can’t order the executive branch to do anything.
The question is why didn’t they get 3rd branch, the Court, involved??? Then they would have standing.
I suspect they knew they couldn’t get the Court’s support.
The 1/6 the branch of government (the House of Reps) is under the delusion that since the US Constitution gives them SOLE POWER to impeach a sitting president, that also gives them authority of subpoena over any material or personnel working for the Executive branch. Not so fast Mr 1/6th.
They did. Several times. And won each time.
This is Trump going to SCOTUS to overrule the lower courts.
We have 3 equal branches of government.
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So they tell us.