evidence: President Joe Biden is calling on the U.S. Trade Representative to triple the China tariff rate on steel and aluminum imports as he makes the rounds in the key battleground state of Pennsylvania. [...] Biden's escalated push to hike tariffs comes as he balances election-year politics with a fragile geopolitical landscape and heightened concerns about the strength of the U.S. economy. [...] Biden, speaking to reporters on Wednesday, insisted that there is "no trade war" with China, despite his call to triple tariffs.