The proposed Eisenhower Memorial, as designed by Frank Gehry.

The debate over the proposed Eisenhower Memorial moved to Capitol Hill yesterday, where legislators and witnesses argued over the merit (or lack thereof) of Frank Gehry’s design.

According to the New York Times, one congresswoman called the design a “monstrosity,” while members of the commission that chose it insisted that Congress shouldn’t enmesh itself in the memorial-making process.

Susan Eisenhower, the 34th president’s granddaughter, again spoke out against Gehry’s design, saying it was “unworkable.” In past hearings, she has been critical of the 80-foot-tall metal tapestries that will frame the memorial site. Last year, she called for a time out until a more agreeable design could be found.

This isn’t the first time that the members of Congress have heard both complaints and commendations for Gehry’s design—it was a year ago this month that another hearing was held, where Gehry announced that he was open to tweaks to the memorial—but yesterday’s hearing was more notable because it came in response to a bill that would require the memorial commission to dump the existing design and go back to the drawing board. Commission members have said that such a move would be unwise, arguing that they have already spent $9 million on Gehry’s design. (The entire memorial is set to cost $142 million.)

The longer the debate goes on, though, the more likely that a delayed opening is. While the commission has said that they plan on opening the memorial to the public on Memorial Day 2015, the existing design has not yet received all the approvals it needs. Additionally, congressional action on Gehry’s design could send the commission back to square one, forcing it to commission new designs.