By Ayesha Rascoe and Sarah N. Lynch

WASHINGTON, Feb 3 (Reuters) - U.S. President Donald Trump will sign executive orders on Friday to review the Dodd-Frank Wall Street reforms and halt a Labor Department rule designed to curb potential conflicts among brokers who give retirement advice, according to a senior White House official.

Trump's move marks a step toward making good on a campaign promise to dismantle the 2010 Dodd-Frank law, which was passed in the wake of the 2007-2009 financial crisis.

Earlier this week during a meeting with business owners, Trump described the Wall Street reform law as "a disaster."

The official said the Dodd-Frank executive order will ask the Treasury secretary to work with other regulators to determine what the administration can do to fix issues with measures issued under the 2010 Dodd-Frank Wall Street reform law.

"There are quite a few things that we could do on Dodd-Frank ... that we think will have fairly immediate and dramatic impact," the official told reporters at a briefing on Thursday.

Some of those changes could include personnel changes at regulatory agencies or additional executive orders, the official added.

The Labor Department's retirement advice rule is not part of the Dodd-Frank law, but has long remained a thorn in the side of the financial services sector.

It was issued by the Obama administration in 2016, and is set to take effect in April.

The rule requires brokers to act as "fiduciaries," or in their clients' best interests, when they are advising them about their individual retirement accounts and 401K plans.

That is a departure from the current legal standard, which requires brokers only to recommend investments that are "suitable" to their clients.

Complying could cost firms as much as $31 billion over the next decade, according to Labor Department estimates.

Trump's memo will ask the Labor Department to determine whether the rule should be revised or be scrapped altogether, the official said.

"We think that they have exceeded their authority with this rule and we think this is something that is completely overreaching," the official said.

Opponents of the rule argued that the rule would result in high costs that will ultimately make small accounts unprofitable.

They have also insisted that the Securities and Exchange Commission, which regulates the brokerage sector, has more expertise and should take the lead on writing new rules.

Dodd-Frank gave the SEC the authority to craft its own fiduciary rule for brokers, but so far, the agency has not advanced such a measure.