The company is extending a policy that currently applies in the United States | Bethany Clarke/Getty Images Twitter tightens political ad rules ahead of EU election Data to be made available to public, company says.

Twitter will introduce new restrictions on political campaign ads on the platform ahead of the European Parliament election May 23-26, the company announced Tuesday.

The company is extending a policy that currently applies in the United States. The effects will include Twitter working to stop non-EU entities engaging in political advertising on the platform.

Pitching itself as the place for serious political conversation, Twitter said in blog post that it "is prepared to play its part in enhancing access to healthy democratic discourse."

Facebook, Google and Twitter have been under intense scrutiny from the European Commission to help prevent foreign interference, especially from Russia, in the European election in May. Google and Facebook have already presented their plan to make political advertising more transparent.

Twitter will store ads endorsing a party or a candidate in its Ads Transparency Center, the company said. Details such as billing information, ad spend, impressions data per tweet and demographic targeting data will be made available to the public. Promoted content from certified accounts will be labelled as such.

Starting March 11, advertisers wishing to promote a party or a candidate will need to go through a certification process to prove they are based in the EU.

Twitter's policy encompasses ads promoting a party or a candidate. Issue-based ads, which attempt to influence voters on an issue such as immigration rather than pull them toward a particular candidate, are not covered, at least for now.

Facebook's ad transparency rules do include issue-based ads, Google has chosen, like Twitter, to focus on content promoting parties and candidates.

All three companies are signatories of the Commission's self-regulatory code of practice to tackle disinformation.

Twitter has also set up an internal election monitoring group to "identify potential threats from malicious actors," and encourage media literacy.