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As UK Prime Minister, Cameron made the decision to hold the Brexit referendum<ref name="Alexander2016"/> and opposed the UK leaving the EU.<ref name="BBCJune2016">[https://www.bbc.com/news/uk-politics-36615028 Brexit: David Cameron to quit after UK votes to leave EU]. ''BBC''. June 24, 2016. Retrieved May 18, 2017.</ref> He resigned immediately after the referendum did not go his way.<ref name="BBCJune2016"/> During the referendum, he asked U.S. President [[Barack Obama]] to say that leaving the EU would put the UK at the "back of the queue" for a new trade deal, something Obama did.<ref>Deacon, Liam (July 2, 2018). [https://www.breitbart.com/london/2018/07/02/confirmed-cameron-obama-brexit-britain-be-back-queue/ Confirmed: Cameron Told Obama to Say Brexit Britain Would Be ‘Back of the Queue’]. ''Breitbart News''. Retrieved July 2, 2018.<br>See also:

As UK Prime Minister, Cameron made the decision to hold the Brexit referendum<ref name="Alexander2016"/> and opposed the UK leaving the EU.<ref name="BBCJune2016">[https://www.bbc.com/news/uk-politics-36615028 Brexit: David Cameron to quit after UK votes to leave EU]. ''BBC''. June 24, 2016. Retrieved May 18, 2017.</ref> He resigned immediately after the referendum did not go his way.<ref name="BBCJune2016"/> During the referendum, he asked U.S. President [[Barack Obama]] to say that leaving the EU would put the UK at the "back of the queue" for a new trade deal, something Obama did.<ref>Deacon, Liam (July 2, 2018). [https://www.breitbart.com/london/2018/07/02/confirmed-cameron-obama-brexit-britain-be-back-queue/ Confirmed: Cameron Told Obama to Say Brexit Britain Would Be ‘Back of the Queue’]. ''Breitbart News''. Retrieved July 2, 2018.<br>See also:

*Delingpole, James (July 2, 2018). [https://www.breitbart.com/london/2018/07/02/obama-meddled-with-uk-brexit-referendum/ Delingpole: Sinister Foreign Leader Caught Trying to Overturn Democratic Vote in UK…] ''Breitbart News''. Retrieved July 2, 2018.</ref>

*Delingpole, James (July 2, 2018). [https://www.breitbart.com/london/2018/07/02/obama-meddled-with-uk-brexit-referendum/ Delingpole: Sinister Foreign Leader Caught Trying to Overturn Democratic Vote in UK…] ''Breitbart News''. Retrieved July 2, 2018.</ref> He apologized to Obama after the British people voted to reassert their national sovereignty and leave the EU.<ref>Gage, John (September 13, 2019). [https://www.washingtonexaminer.com/news/british-premier-david-cameron-told-obama-im-sorry-over-brexit British premier David Cameron told Obama ‘I’m sorry’ over Brexit]. ''Washington Examiner''. Retrieved September 13, 2019.</ref>

After his tenure as prime minister ended, Cameron continued speaking out against [[populism]], though he admitted that it is not enough for the [[liberal elite]]s simply to dismiss conservatives' concerns on issues such as mass migration.<ref>Deacon, Liam (June 10, 2018). [https://www.breitbart.com/london/2018/06/10/david-cameron-returns-attack-populism-immigration-concerns-ignored/ David Cameron Attacks Populism, But Admits Popular Immigration Concerns Have Been Ignored]. ''Breitbart News''. Retrieved June 11, 2018.</ref>

After his tenure as prime minister ended, Cameron continued speaking out against [[populism]], though he admitted that it is not enough for the [[liberal elite]]s simply to dismiss conservatives' concerns on issues such as mass migration.<ref>Deacon, Liam (June 10, 2018). [https://www.breitbart.com/london/2018/06/10/david-cameron-returns-attack-populism-immigration-concerns-ignored/ David Cameron Attacks Populism, But Admits Popular Immigration Concerns Have Been Ignored]. ''Breitbart News''. Retrieved June 11, 2018.</ref>