European leaders still need quite a bit from Trump. The EU has not ratified the trade deal (July 4 deadline from Trump). The US has checked out of Ukraine war and rerouted military hardware from Europe to the Middle East. Macron's personal relationship with Trump (Versailles dinner) may be the most productive channel.
Merz broke ranks publicly criticizing Trump, but other leaders have been quieter. Georgia Maloney pushed back on Trump's criticism of the Pope. European nations resisted US use of their military bases for Iran operations. Macron understands Trump better than other leaders and secured a one-on-one dinner at Versailles.