A spokesperson for the Ministry of Justice said the Government is "considering how best to proceed" following the European Court of Human Rights' judgment on giving prisoners the right to vote.
"An announcement will be made to Parliament shortly", the spokesperson added.
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An "erratic" driver sparked a security alert after ploughing into a police car near the US Congress and nearly mowing down several officers.
Thousands of people have linked hands on Westminster Bridge in a show of solidarity - one week after the terror attack in the capital.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.