According to CoinMeta, former British Prime Minister David Cameron warned Prime Minister Andy Burnham not to push for the UK to rejoin the EU, arguing that restarting the debate about Brexit could weaken the UK's negotiating position in efforts to improve relations with Europe. Cameron stated that the UK should focus on becoming the best partner to the EU, rather than overturning the results of the 2016 referendum on leaving the EU. Burnham had previously said that the disadvantages of Brexit outweighed the advantages and mentioned that options such as rejoining the EU, joining a customs union, or the single market were all under consideration. The UK and the EU are scheduled to hold a summit later this month to advance agreements on youth mobility, agricultural trade, and carbon emission markets. Cameron also opposed joining a customs union, stating that this would force the UK to abandon trade agreements reached with other countries after Brexit. He believes that the UK's current economic problems are mainly due to government overspending, excessive borrowing, high tax burdens, and excessive regulation, rather than Brexit itself.