The government has suffered a series of defeats in the House of Lords on its secret courts legislation.
Peers from across all political parties voted through a series of safeguards to the use of closed material proceedings (CMPs).
CMPs will prevent claimants in civil cases from hearing all the evidence in case of compromising national security.
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The five living former US presidents appeared together for the first time since 2013 to raise money for hurricane victims.
Some 465 seats are up for grabs in the lower house, which Abe dissolved last month to call a snap election amid rising approval ratings.
Ministers are also looking at schemes such as “lock-in agreements” to reduce the 250,000 sales that fall through annually.