Pelosi withholding the articles from the Senate. Since neither Democrats or Republicans can afford a trial in the Senate for risk of corruption exposure; therefore, my bet is whomever pulls the Pelosi strings, likely someone outside the USA (GS), is working the up and down line vote in the Senate. The articles won't be released to the Senate unless they are assured they win the line vote for impeachment in the Senate. Whole lot of black mail lobbying going on inside the Senate for those yay votes for impeachment would be my guess.