Mueller refuses to say if his report recommends impeachment; Some 2020 Dems renew impeachment calls after Mueller testimony; Trump's first reaction: "We had a very good day today"; Trump after Mueller testimony: "Today proved a lot to everybody"; Following Mueller testimony, Senate Dems to push for legislation to secure election; Mueller's testimony repeatedly refutes claims made by Trump; Mueller's testimony contradicts Trump's repeated claims of "total exoneration"; First Trump comments after testimony from Robert Mueller via Knit