Ruth Davidson on Thursday resigned as the Conservative Party's leader in Scotland.

She quit amid a growing backlash against UK Prime Minister Boris Johnson's plan to suspend Parliament, citing both personal and political reasons for her departure.

She campaigned against Brexit and has repeatedly criticized Johnson in the past.

Davidson led the Conservative Party's recent surge in Scotland and helped Theresa May avoid losing the most recent general election.

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Ruth Davidson has quit as the leader of the Scottish Conservatives.

Davidson announced her resignation Thursday morning amid widespread fury over Prime Minister Boris Johnson's move to suspend Parliament in the weeks leading up to the United Kingdom's planned exit from the European Union.

She said that she was standing down primarily so she could spend more time with her family and that the prospect of "spending hundreds of hours away from my home and family now fills me with me dread."

She added: "I fear that, having tried to be a good leader over the years, I have proved a poor daughter, sister, partner, and friend. The party and my work has always come first, often at the expense of commitments to loved ones.

"The arrival of my son means I now make a different choice."

Davidson gave birth to her first child, Finn, in October.

Davidson also cited change in the "wider political context" and the "conflict I have felt over Brexit" as factors.

She campaigned to stay in the European Union and is strongly opposed to a no-deal Brexit.

When Johnson became prime minister, Davidson publicly warned him that she would not support him if he pursued a no-deal exit from the EU.

"I hope beyond measure the new prime minister is successful in getting an agreement with the EU so he can go back to the House of Commons and get the majority backing he needs," she said. "He has my full support in those efforts.

"Where I differ with the UK government is on the question of a no-deal Brexit.

"When I was debating against the pro-Brexit side in 2016, I don't remember anybody saying we should crash out of the EU with no arrangements in place to help maintain the vital trade that flows uninterrupted between Britain and the European Union.

"I don't think the government should pursue a no-deal Brexit and, if it comes to it, I won't support it."

In her letter to the party's chairman in Scotland, Davidson said "I hope and believe" she represented Scottish industries in the Brexit process amid the growing prospect of the UK leaving the EU without a deal.

The Conservatives lose one of their strongest assets

Davidson's resignation comes the day after Johnson triggered outrage by moving to suspend Parliament for five weeks, reducing the time that members of Parliament will have to work to avoid a no-deal Brexit.

Read more: Over a million people sign petition against Boris Johnson's Brexit plan to suspend Parliament as protests break out across the UK

In a press conference Thursday morning, she said Johnson told her "categorically" he wanted to leave the EU with a deal.

—BBC Scotland News (@BBCScotlandNews) August 29, 2019

Davidson, the member of Scottish Parliament for Edinburgh Central, became Conservative leader in Scotland in 2011.

She is credited with engineering the Tory party's recent surge north of the border.

The Conservatives returned 12 MPs to the House of Commons at the 2017 general election, with their largest share of the vote in Scotland since 1979. Johnson's predecessor, Theresa May, most likely would have lost the most recent general election without the success of Davidson's Scottish Conservatives.

After Davidson's resignation, May tweeted to say she was "sorry" to see Davidson step down.

Her decision to stand down as leader is a blow for Johnson ahead of a possible general election later this year.

In her letter, she described being the party's Scottish leader as the "privilege of my life."

Here is Davidson's resignation letter

Earlier in the day Lord Young quit as a Conservative government whip in the House of Lords, over the prime minister's decision to suspend Parliament from early-September until mid-October.