(Reuters) - Morgan, Lewis & Bockius said Wednesday it was stepping away from advising Donald Trump on tax matters, leaving the former president and his businesses further isolated from the country's largest law firms.

The firm emphasized in a statement it "had a limited representation" of Trump and his main business, the Trump Organization, on tax matters. "For those matters not already concluded, we are transitioning as appropriate to other counsel," the firm said.

The statement was first reported by The American Lawyer. A spokeswoman for Morgan Lewis declined to elaborate on the firm's plans or its reasoning.

Trump's long refusal to release his tax returns and separate himself from his business interests while in office helped to publicize the role that Morgan Lewis and two of its Washington, D.C.-based partners, Sheri Dillon and William Nelson, played in advising the former president or his company.

Dillon, who joined Morgan Lewis in 2015, has advised Trump on tax matters since 2005. Nelson, who joined the firm in 2014, has also handled tax work for Trump. Both worked together at the defunct Bingham McCutchen and McKee Nelson law firms.

The Trump Organization did not respond to a request for comment on Morgan Lewis' statement.

In the aftermath of the November election, Snell & Wilmer and Porter Wright Morris & Arthur both withdrew from representing the Trump campaign in litigation contesting the election results. The Trump campaign's outside counsel firm, Jones Day, distanced itself from post-election efforts to challenge Biden's victory.

Firms associated with lawsuits aimed at overturning the election results had faced a barrage of criticism from The Lincoln Project as well as law student activists.

This month, after baseless claims of voter fraud by Trump and others culminated in the Jan. 6 assault on the U.S. Capitol, Seyfarth Shaw dropped the Trump Organization as a client, while other law firms suspended or pledged to review their donations to political candidates. Others called for Trump's immediate removal via the 25th Amendment.

The American Lawyer also reported Wednesday that Alston & Bird is no longer representing Trump, his children and the organization in a lawsuit accusing them of exploiting their name to promote a marketing scam.

Alston & Bird partner Joanna Hendon is still listed as the only attorney representing Trump, his children, and his company, according to federal court records. A firm spokesman told The American Lawyer that the case is being handled by another firm on appeal and that "our firm has no intention of representing the president" if the case comes back to the trial level.

Neither Hendon or an Alston & Bird firm spokesman responded to requests for comment.