https://www.law.cornell.edu/uscode/text/18/part-I/chapter-115 18 U.S. Code CHAPTER 115—TREASON, SEDITION, AND SUBVERSIVE ACTIVITIES
https://dailycaller.com/2019/12/06/republicans-alexandra-chalupa-ukraine GOP Senators Seek Interview With Ex-DNC Contractor Who Worked With Ukrainians In 2016 Sens. Chuck Grassley, Ron Johnson and Lindsey Graham said Friday that they are requesting the records from Alexandra Chalupa, the former DNC contractor, and Andrii Telizkhenko, a former political officer who worked in the Ukrainian embassy.
https://www.politico.com/news/2019/12/05/senate-republicans-impeachment-trial-076673 Senate Republicans puncture House GOP dreams for impeachment trial GOP leaders have no interest in turning the Senate into a circus with the hard-line demands of Trump's House allies. On Wednesday, a conservative backbencher in the House issued an explosive request to Senate Judiciary Chairman Lindsey Graham: Subpoena the phone records of House Intelligence Chairman Adam Schiff. On Thursday, Graham had a succinct response: “We’re not going to do that.”
You are taking a dispute about calling another member of Congress (schiff) and extrapolating it to the bidens for example. Don't get too excited about that yet. There is resistance to calling Schiff based on not wanting to mess with other congressional members but those complications do not go with the bidens. You have to wait and see. Your desired outcome being noted but I am not sure that your wishes are the determining factor for them. Republicans want Hunter Biden, Rep. Schiff and whistleblower to testify on impeachment https://www.reuters.com/article/us-usa-trump-impeachment-republicans/republicans-want-hunter-biden-rep-schiff-and-whistleblower-to-testify-on-impeachment-idUSKBN1YA2JH
https://www.aol.com/article/news/20...led-to-seal-the-deal-on-impeachment/23875555/ New Yahoo News/YouGov poll shows that Democrats have so far failed to seal the deal on impeachment