Because Trump has 2.5 years left and they may be hoping a Democrat wins
Does it matter who is president? The US was spying on European leaders before Trump's first term:
"According to the investigation, which covered the period from 2012 to 2014, the NSA used Danish information cables to spy on senior officials in Sweden, Norway, France and Germany, including former German Foreign Minister Frank-Walter Steinmeier and former German opposition leader Peer Steinbrück."
https://www.reuters.com/world/europe/us-security-agency-spie...
Trump was elected. Twice. It was not a fluke, not a once in a lifetime event, he's a symptom of wider processes happening in the US. The world has changed and the old order is not coming back