Alternative for Germany has joined France’s National Rally and Reform U.K. in becoming the most popular party in its country, according to polls.

A poll Tuesday showed Alternative for Germany — which is under surveillance by the country’s intelligence services over suspected extremism — is now the most favored by voters. The survey by broadcaster RTL put the AfD at 26%, ahead of the ruling Christian Democrats at 24%.

This is a high watermark for the European far right, a once fringe movement whose virulently anti-immigration, anti-Islam and culture-war politics were shunned by the mainstream just a decade ago.

Today, these parties have developed deep ties with President Donald Trump and his Republican allies, who openly cite nationalists such as Hungarian Prime Minister Viktor Orbán as inspirations on policy and tactics.