William Barr, President Donald Trump’s nominee for U.S. attorney general, will seek to persuade senators Tuesday that he’ll protect special counsel Robert Mueller III’s investigation from political interference, according to his written remarks released by the Justice Department.

“If confirmed, I will not permit partisan politics, personal interests, or any other improper consideration to interfere with this or any other investigation,” Barr will tell senators, according to his prepared testimony. “I will follow the Special Counsel regulations scrupulously and in good faith, and on my watch, Bob will be allowed to complete his work.”