Manifesto pledgepublished at 08:40
Mr Loughton also says some of the welfare reforms the party put forward as part of its election manifesto are key to the negotiations so "that people can not just come to the UK and claim benefit".
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Yvette Cooper officially launches her Labour leadership campaign
Labour leader contenders Andy Burnham and Liz Kendall deliver keynote speeches
Mario Cacciottolo, Gavin Stamp and Brian Wheeler
Mr Loughton also says some of the welfare reforms the party put forward as part of its election manifesto are key to the negotiations so "that people can not just come to the UK and claim benefit".
Conservative MP Tim Loughton, founder of the Fresh Start group of MPs which wants the UK to stay in the EU but with far-reaching reforms, says Mr Cameron is right to seek reform of the EU, especially over immigration.
"The basic principle of the European Union on free movement of labour is about free movement of labour. It's not about free movement of people claiming benefits," he says.
Mr Cameron met Prime Minister Ewa Kopacz bright and early in Lazienki palace in Warsaw - although, by the look of things, breakfast was in short supply.
David Cameron is on a whistle-stop tour of Europe in his continuing efforts to raise support for changes he wants made to the European Union, before the UK's EU membership referendum is held.
Good morning and welcome to Friday's live page taking in all the day's political events.
Prime Minister David Cameron is in Poland for breakfast with the country's prime minister, Ewa Kopacz. By lunchtime he'll be in Berlin, meeting German Chancellor Angela Merkel.