Chelsea Clinton, vice chair of her family's foundation, and Donna Shalala, president of the Clinton Foundation, traveled to Haiti week with a group of foundation supporters to survey the philanthropy's work in that country, much of which has been controversial.

Their visit gave critics an opportunity to address the millions of dollars that seemingly disappeared inside the country under Hillary Clinton's watch as companies connected to the former secretary of state received lucrative contracts in the wake of the 2010 earthquake there.

The Clinton Foundation alone raised more than $30 million for Haiti in the wake of the 2010 earthquake that claimed more than 200,000 lives.

But the famous philanthropy and the State Department were each involved in a number of reconstruction projects that highlight some of the weaknesses often cited in discussions of Hillary Clinton's tenure as secretary of state, including suggestions that she opened herself up to potential conflicts of interest.

For example, the Clinton Foundation said it tapped Clayton Homes, a construction company owned by Warren Buffett's Berkshire Hathaway, to build temporary shelters in Haiti through a normal bidding process that included a review of the competing companies by United Nations experts.

UN officials later said the contract was never competitively bid, according to a Nonprofit Quarterly report. The foundation then refused to reveal the names of the experts used or clarify the method by which Clayton obtained the lucrative contract, the report said.

Buffett has been an active member of the Clinton Global Initiative.

Clinton insiders played key roles in directing the flow of aid dollars into Haiti.

Cheryl Mills was the "point person" for USAID's response to the Haiti earthquake, Politico reported in 2013.

Mills was at the center of a number of Clinton-linked controversies during her time at the State Department, including two alleged cover ups of misconduct involving an ambassador and an ambassador-designate.

Bill Clinton was named co-chair of the Interim Haiti Recovery Commission, the organization formed to help the Haitian government coordinate the international donations that were then pouring into the country.

But last year, a Haitian newspaper reported two attorneys had asked Haiti's Superior Court of Auditors and Administrative Disputes to look into whether Bill Clinton had mismanaged the commission.

In 2011, the Clinton Foundation reportedly brokered a $45 million deal with Digicel, a cell phone service provider, to open a hotel for aid workers in Port-au-Prince.

Owned by Denis O'Brien, a close friend of Bill Clinton's, Digicel raked in millions after it set up a mobile system for transferring money via text message — an idea both Clintons reportedly endorsed.

O'Brien helped Bill Clinton secure three speaking engagements in his native Ireland and even covered some of the event costs himself, according to the Irish Times.

Digicel was one of the first recipients of funds from the Haiti Mobile Money Initiative, launched by USAID in June 2010.

By 2012, Digicel had taken over more than three-quarters of the mobile market in Haiti, according to Peter Schweizer's book Clinton Cash.

Attempts to scrutinize the contract dollars were apparently stifled within the Haitian government.

For example, in 2012, then-Prime Minister Garry Conille stepped down amid tensions with the country's president — some of which stemmed from the fact that Conille had called for an audit of earthquake relief contracts.

The State Department and the Clinton Foundation even teamed up in Haiti.

In one case, the two worked to build a sprawling industrial park in northern Haiti that was projected to create 60,000 new jobs.

Bill and Hillary Clinton both attended the grand opening of Caracol Industrial Park in October 2012, touting the project as a major success.

Secretary of State Hillary Clinton meets with Haitian President Michel Martelly at the Caracol Industrial Park in Haiti on Oct. 22, 2012.

Sean Penn (left), Ben Stiller (far right) and other celebrities attend the Caracol Industrial Park grand opening ceremony. (AP Photos)

Sean Penn and Ben Stiller were among the celebrities who attended the Caracol park's opening.

But a year after its opening, the Caracol park was home to just 1,500 jobs — a far cry from the projected 60,000.

"Hundreds of smallholder farmers were coaxed into giving up more than 600 acres of land for the complex, yet nearly 95 percent of that land remains unused," said an Al Jazeera report in September 2013 of the ambitious industrial park.

Clinton's USAID also planned to build housing projects near the park, setting out to construct 15,000 homes for impoverished Haitians.

Skyrocketing costs and poor management led the agency to scale back its target from 15,000 homes to just 2,649.

For example, while USAID originally projected each taxpayer-funded house would cost $8,000, a Government Accountability Office report later found each house actually cost more than $23,000.

The USAID inspector general acknowledged an investigation into the Caracol housing project after locals complained about the poorly-constructed homes, according to the Center for Economic and Policy Research.