The Liberal Democrats have gained 8,000 new members in the two days since Theresa May called a snap election.
The increase in members is the fastest rise of new membership in the party's history.
The party now has over 95,000 members, more than double what it was at the time of the last general election.
Commenting, President of the Liberal Democrats Sal Brinton said:
"People are flocking to the Liberal Democrats as we are the only party who are offering effective opposition to this Conservative Brexit government.
"Theresa May: we have the troops for this fight and they are raring to go.
"The Liberal Democrats are the only party standing up for an open, tolerant, and united Britain."