craig has more on who this partial shutdown will affect. >> reporter: the government shutdown means some federal workers, like department of agriculture employee mike lewis, maybe without their next paycheck. >> you try to prepare for it but it's hard to prepare for something like this so you try to do best you can. >> reporter: without a deal, overnight, funding ran out for nine federal agencies that employ about 800,000 people. those deemed essential, like air traffic controllers, t.s er plet without pay. about 400,000 others would be furloughed. >> i think we'll get one more paycheck, because we just put in our pay, but after that, you fue stands. >> reporter: there are parts of the government that won't be affected, including the pentagon, the v.a., and all congressional staff. the u.s. postal service will continue to deliver mail. social security checks will still be sent out, and special counsel robert mueller's russia investigation will press forward. but perhaps the most visible impact will be at our national parks and the sites that are able to stay open will do so without national park service staff responsible for maintaining restrooms and run