The US doesn't need to spy on the German chancellor to be certain of this. There is no conceivable plot that Germany could be involved in that could damage the US, and both countries know this. Same with the UK, Israel, France, etc.
The EU doesn't import US beef because of banned chemicals used to raise US cows. Imagine if the EU implemented more stringent requirements on, say, GM foods. Or other livestock. Banned the pesticides used in California Oranges, etc.
Trade agreements, tariffs, standards and sanctions - there are many ways for European countries to damage the US economically.
