This move was suggested the other day by none other than the excreable Hugh Hewitt when Nunes appeared on his radio show. According to Hewitt, due to separation of powers, the Congress can’t subpoena the Court to testify, but can invite them to do so. We’ll see.
Nunes has been subpoenaing the DOJ which is a separate branch of the government (executive), so not sure that would stop it. I think the bigger question is would any judge respond to it. This Congress needs to build its enforcement arm back up, as allowed by the Constitution and previously utilized in decades (if not centuries) past, to give their demands and investigation results more teeth. Right now everyone seems stuck waiting for the slumbering AG to awake from under his tree and find his way back home.