The government shutdown enters day 18 as President Trump prepares to address the nation Tuesday evening from the Oval Office. The Washington Post's Christine Emba argues that major networks should not carry Trump's primetime address, which will focus on the border wall. Samsung is feeling the pain from China's economic downturn. The tech giant says its fourth-quarter earnings results will come in well below estimates due to slowing memory chip demand. Plus, Amazon surpasses Microsoft to become the most valuable publicly traded company in the world.