Brett Kavanaugh and the woman accusing him of a decades-old sexual assault both indicated Monday they would be willing to testify to a Senate panel as the confirmation of President Donald Trump's Supreme Court nominee shifted from seemingly painless to problematic.

President Donald Trump's lawyers composed a secret 20-page letter to special counsel Robert Mueller to assert that he cannot be forced to testify while arguing that he could not have committed obstruction because he has absolute authority over all federal investigations.