WATCH: Jack Smith warns that Americans are taking the rule of law for granted

Former special counsel Jack Smith told a House committee Thursday that he fears Americans now take the idea of "rule of law" for granted, and that its execution depends on "collective commitment."

Watch Smith's remarks in the video player above.

In a hearing focused on Smith's investigations into President Donald Trump's mishandling of classified documents and role in the Jan. 6 attack, Smith said as a public servant in international settings, he has "seen how the rule of law can erode," adding that many Americans may now take it for granted in the U.S.

WATCH: 'I stand by my decision' to prosecute Trump, Jack Smith says in House testimony

"The rule of law is not self-executing. It depends on our collective commitment to apply it. It requires dedicated service on behalf of others, especially when that service is difficult and comes with costs," Smith said.

The hearing is an opportunity for the career prosecutor to publicly offer his inside perspective on the investigations, which both led to unprecedented indictments. Both were scuttled once it was clear that Trump would return to the Oval Office; Department of Justice policy prevents prosecution of a sitting president.

Republicans and the president have accused Smith of pursuing a politically motivated case against the president. Trump has denied wrongdoing while attacking Smith, calling him a "criminal" who ought to be investigated and "put in prison."

Smith defended his investigations in an hourslong closed-door meeting with lawmakers in December, saying he said he had "proof beyond a reasonable doubt" of what his investigations laid out. He's denied accusations of bias.