Senate Intelligence: U.S. must create effective deterrence against an ongoing Russian threat to elections; Bipartisan senate report says vulnerabilities remain after 2016 Russian election attack; Hours after Mueller warns of Russian interference, GOP senators block elections security bills; Pelosi: Won't discourage democrats from supporting impeachment; House voting on controversial budget and debt deal; Democrats debate next steps after Mueller testimony; Documents reveal hundreds of red flags raised internally about how Trump administration was separating families at border; Biden jabs back at rivals as CNN debate nears; via Knit