[6] On 28 October 2015, De Graaff voted multiple times for Le Pen in her absence, which is against the European Parliament's rules.
[11] In 2022, he defected to Thierry Baudet's Forum for Democracy (FvD) party after expressing support for its more hardline stance against the COVID-19 vaccine and criticising the PVV's pro-vaccine policies.
[13] De Graaff was one of 16 MEPs who voted against condemning President Daniel Ortega of Nicaragua for human rights violations, in particular the arrest of Bishop Rolando Álvarez.
[16] Nederlands Dagblad noted that De Graaff copied President Vladimir Putin's rhetoric in defense of the war.
[17] The home and office of one of De Graaff's assistants was raided in May 2024 by Belgian and French authorities, respectively, in an investigation into Russian interference in European politics.
The Czech government had discovered earlier that MEPs had received payments for repeating Russian talking points through the online publication Voice of Europe.
[18] De Graaff was planning to run for another term in the June 2024 European Parliament election in Belgium's Dutch-speaking electoral college.