Trump is doing what many leaders do when their careers are at risk - they start a war, and, sadly, many people fall for this dangerous ploy because it is dressed up as patriotism.
Apart from the impeachment issue, Trump has lost a great deal of support from people in rural communities who form a significant part of his support group.
From the website Politico, June 2019, and widely reported elsewhere:
"President Donald Trump’s trade war is magnifying some of the toughest farm conditions since the crisis that bankrupted thousands of farmers in the 1980s — and threatening a constituency crucial to his re-election hopes.
The president’s trade policies have sent U.S. agricultural exports plunging, exacerbating already difficult economic conditions facing farmers. Average farm income has fallen to near 15-year lows under Trump, and in some areas of the country, farm bankruptcies are soaring.
The fate of the farm economy and rural America is fused to Trump’s political future. Farmers and ranchers make up the heart of his base, and their support in battleground Midwestern states like Iowa and Wisconsin could help determine the 2020 presidential election. Although Trump’s standing with those groups generally remains strong, cracks are starting to show."
So, time to create a (very dangerous) distraction - from the man who claims to "Put America First".