Germany's political newcomer, the Sahra Wagenknecht Alliance (BSW), filed a complaint on Monday with the constitutional court seeking to legally challenge the results of the national election, a spokesperson said.

The leftist populist BSW, which was created last year, scored 4.97% in last month's election, lacking just 13,400 votes to enter parliament in a country where around 60 million people are eligible to cast a ballot.

"Several thousand BSW votes have apparently been incorrectly allocated to other parties or deemed invalid," the party's eponymous leader Sahra Wagenknecht was quoted as saying by paper the Frankfurter Allgemeine Zeitung (FAZ).

Respect for the voters demanded that "possible errors be scrutinised and corrected", she was cited as saying.