In 2019, President Donald Trump’s obsession with Fox News had a major impact on the nation’s political environment, driving the administration’s responses to a sea of scandals and crises that have culminated with his impeachment and regularly dictating the domestic and foreign policies of the United States.

Trump sustained his well-documented fixation on the network, continuing his practices of giving the vast majority of his national televised interviews to Fox hosts, maintaining a revolving door between his administration and the company, and relying on Fox personalities for private counsel. He kept watching hours of daily programming from Fox News and its sister network, Fox Business, basking in sycophantic coverage from shows like Fox & Friends, Lou Dobbs Tonight, and Hannity. And continuing the Trump-Fox feedback loop, he maintained his habit of firing off hyperaggressive tweets in response to what he saw on those networks, sending 613 such live tweets this year through December 17.

But more than ever before, Trump’s Fox fanaticism this year drove the federal policymaking process and political reality, with a tangible impact on the lives of the American public.

2019 began with the federal government partially shut down because, as one Fox host put it, network star Sean Hannity was “running this government” and Trump had taken his advice over that of the president's congressional allies.

In the months that followed, the administration appeared to pardon war criminals, decide whether to order military strikes, float sweeping policy changes, award a $400 million federal contract, and initiate federal investigations based on the advice the president was getting through his television set and in behind-the-scenes discussions with Fox personalities.

And as 2019 comes to a close, the House of Representatives passed two articles of impeachment submitted in response to a presidential abuse of power that was driven at every turn by the network the president adores. Fox is also playing a key role in shoring up Trump’s base with a wave of misinformation -- as one network contributor told Hannity, “You are the difference between Donald J. Trump and Richard Nixon.”

Meanwhile, the network shaped the landscape for the rest of Trump’s party, with congressional Republicans bucking for presidential favor with Fox appearances and adopting its talking points to defend him in important hearings.

The timeline below details the most important ways the Fox-Trump feedback loop affected politics and policy this year. But it’s just a snapshot of the president’s Fox obsession. He also tweeted about the network’s coverage of his sycophants’ books, trade talks with China, the “dishonest” media, gas prices, unemployment among veterans, Volkswagen’s U.S. investments, a “big new Caravan,” the Clemson Tigers, the success of border walls, crimes committed by undocumented immigrants, “bad lawyer Michael Cohen,” purported “voter fraud,” Bible literacy, Andrew McCabe, California infrastructure funds, Spike Lee, Kim Jong Un’s travel arrangements, Ilhan Omar, Star Parker, climate change, how planes are “becoming far too complex to fly,” Jay Leno, Lisa Page, Brexit, the “Jexodus” movement, General Motors, Google, riots in Paris, ISIS, Adam Schiff, Jerry Nadler, the 2020 U.S. census, Harley-Davidson, Twitter, “Weirdo Tom Steyer,” NFL draft pick Nick Bosa, “TREASON!,” consumer sentiment, Nancy Pelosi, tariffs on Mexico, Joe Biden, Michael Flynn’s legal representation, Fox host Pete Hegseth’s engagement, Iran’s nuclear program, polls, Hillary Clinton’s emails, Megan Rapinoe, MS-13, Eric Swalwell, Bernie Sanders, crime in Baltimore, Somali refugees, infrastructure spending, socialism, mass shootings, Israel, interest rates, Diamond and Silk’s live show, James Comey, London’s mayor, “Debra The Mess Messing,” AFL-CIO President Richard Trumka, Hurricane Dorian, Brett Kavanaugh, net neutrality, Syria, and NBA coach Steve Kerr.

There’s no sign any of this is likely to reverse itself in 2020. Indeed, Trump is reportedly more unshackled than ever. And that means he is ever more reactive to what he sees coming through his TV every day.