Probably because polls are indicating a wane in a desire to impeach. New polls show a slight increase in support for impeachment Two polls taken after the public hearings show a slight increase in support compared to the weeks prior. And one suggests support among independents may be growing. https://www.vox.com/policy-and-politics/2019/11/26/20983609/new-trump-impeachment-polls-after-hearings-increase-support