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The PM believes the UK should stay part of the European Arrest Warrant (EAW) and the EU's law enforcement body Europol, according to sources. In a in Munich next Saturday, she will argue that the EAW – which is valid throughout all the EU's member states – has helped keep Britain safe. In 2016-17, a total of 196 people were arrested using the warrant after a request from the UK, up from 150 in the previous year.

Insiders said Theresa May will use her speech in the German capital to make a "big offer" to the EU to continue security co-operation. It is hoped the offer will make Brussels negotiators more willing to give Britain a bumper post-Brexit trade deal, according to the Sunday Times. However, many Brexiteers are firmly opposed to the UK remaining part of the EAW because it is policed by the European Court of Justice (ECJ). Former Brexit minister David Jones said: "Whatever the utility of the arrest warrant, it is imperative to ensure that the jurisdiction of the ECJ does not prevail."

GETTY Theresa May wants to keep co-operation with the EU on security issues

Barnier meets Davis in London ahead of crucial Brexit talks Mon, February 5, 2018 Michel Barnier and David Davis head to Downing Street for crucial Brexit talks. Play slideshow AFP/Getty Images 1 of 11 Michel Barnier and David Davis head to Downing Street for lunch meeting

Mrs May's high-profile address in Berlin is being dubbed 'The Road to Brexit' by Downing Street aides. It will follow speeches by Cabinet ministers Boris Johnson, David Davis, Liam Fox and David Lidington also outlining the UK's position. Foreign Secretary Mr Johnson will kick-off the Brexit blitz on Wednesday with a call for unity following weeks of Cabinet bickering. He will also assure Remainers that they should not fear Britain's impending exit from the European Union. No10 officials have reportedly "taken the red pen" to Mr Johnson's text so his comments keep to the areas they want him to address.

GETTY The Prime Minister will give a high-profile speech on Brexit in Munich