>> shepard: 23 minutes past the hour now. paul manafort could be behind bars before he goes to trial. the special counsel, robert mueller's team, is accusing him of trying to tamper with witnesses in his own criminal case. one witness says he felt manafort was trying to get him to commit perjury. that's according to court documents. prosecutors write that paul manafort and one of his associates repeatedly contacted two witnesses, sometimes using encrypted messaging to try to influence their testimony. if true, that's a violation of his conditions for house arres and a crime in and of itself. so the feds are asking a judge to transfer manafort to jail. he's pleaded not guilty of conspiracy against the united states. he's not been charged with witness tampering. he's accused of funneling payments through foreign companies and bank accounts as part of political work for the pro russia president of ukraine.