AUSTIN — Growing his campaign war chest to nearly $14 million, incumbent Republican Dan Patrick will report raising another $4.5 million to fend of Democratic challenger Mike Collier, who raised a fraction of that amount in the three-month period ending June 30.

On Thursday, Patrick announced that his new campaign-finance disclosure report to be filed by a Monday deadline will show he will have raised more total contributions in two election cycles than any other lieutenant governor in Texas history.

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“The broad support the Lt. Governor has received from business and grassroots leaders across the state is reflected in this $4.5 million fundraising report — bringing the total amount he has raised since he first announced he was running for lieutenant governor to $45 million,” said Allen Blakemore, Patrick’s chief campaign strategist.

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“People know Dan is a principled conservative leader who does the right thing and doesn’t back down. They like him, they trust him, and they want to see him re-elected.”

Patrick, a businessman and a former conservative talk-radio host, was elected lieutenant governor in 2014, and served eight years before that in the state Senate representing parts of Houston.

Collier, a retired Kingwood accountant and businessman, on Monday reported he has raised a total of $670,000 during his year-long campaign -- including more than $300,000 during the second quarter of this year -- and had $60,000 in his campaign bank account at the end of June.

He has campaigned to reform property taxes and improve funding for public schools, and has accused Patrick of being beholden to special interests that fund his campaigns.

OUT OF STATE: Beto O'Rourke vs. Ted Cruz draws millions in contributions from outside Texas

While Patrick remains ahead in all recent polls, some have reported that his lead has shrunk in recent months.

mike.ward@chron.com

Twitter.com: @ChronicleMike