I say lets make a deal. Open hearings when Trumpybear agrees to testifies under oath.
No, let's not. Currently, the House is taking depositions.
Let's have a fact-finding that is orderly, protecting witnesses and the integrity of the process, and without the bloviation and grandstanding public hearings inevitably entail. Oh, and, let's have as little by way of an open flank to the Goobers' Trumpish obstruction as possible.
Then, when the information is gathered and deemed sufficient, write up the Articles of Impeachment, publish the supporting evidence and, if necessary, have public hearings.
If required, subpoena Trump to testify under oath.
Let him refuse, and add another Article of Impeachment, if he so chooses.