President Trump intends to ramp up his existing immigration agenda, "raising and enhancing the standard for entry" to the U.S. if elected for a second term, senior adviser Stephen Miller told NBC News.

Why it matters: The Trump administration has faced backlash throughout the president's first term for making it harder for legal immigrants and undocumented border-crossers hoping to enter the country.

In a new ad, Joe Biden pledges to sign an executive order to form a task force dedicated to finding the parents of 545 children separated from their families at the southern border.

Why it matters: The Biden campaign is focusing on Latino voters just days before the election. The campaign had previously launched an ad focused on the family separations at the border called "Números."

President Trump defended his now-reversed family separation policy at the third presidential debate Thursday, claiming children were brought to the U.S. "by coyotes and lots of bad people," while Joe Biden said it "violates every notion of who we are as a nation."

Driving the news: A court filing revealed this week that the U.S. government cannot locate the parents of 545 migrant children separated under a 2017 pilot program as part of President Trump’s immigration policy. The number of parents who are currently considered “unreachable” is larger than was previously known.

The U.S. cannot locate the parents of 545 migrant children separated under a 2017 pilot program as part of President Trump’s immigration policy, NBC News first reported, citing a filing from the American Civil Liberties Union.

Why it matters: The number of parents who are currently considered “unreachable” is larger than was previously known. Search efforts have grown increasingly difficult given the time that has passed between when the children were released from federal custody and when volunteers started trying to find them.

The Supreme Court on Friday said it would decide whether the Trump administration can exclude unauthorized immigrants from the 2020 census count, setting arguments for Nov. 30.

Why it matters: Civil rights groups fear that leaving undocumented people living in the U.S. out of the survey could lead to to an undercount, which would affect how House seats are reapportioned and how federal funding is distributed over the next 10 years.

The Trump administration announced new, long-anticipated restrictions for the H-1B high-skilled visa program on Tuesday, some of which will go into effect this week.

Why it matters: The rules are "far and away, one of the most significant reforms made to the H-1B program in the past 20 years," deputy secretary of Labor Patrick Pizzella told reporters on a call.

The Trump administration plans to only admit a maximum of 15,000 refugees this fiscal year, the State Department said in a release late Wednesday evening.

Why it matters: This is yet another record-low refugee cap. Before leaving office, President Obama set the refugee limit at 110,000 for fiscal year 2017 — a number Trump has continued to slash throughout his presidency.

The Trump administration will reimpose a new wealth and health "public charge" test for green card applicants in the U.S., after the rule was previously blocked by a court injunction in July because of the coronavirus, according to the U.S. Citizenship and Immigration Services website.

Why it matters: The rule could have a drastic impact on the half million or so immigrants in the U.S. who receive green cards — the first step to citizenship — each year. 69% of recent green card recipients had at least one negative public charge factor, according to the Migration Policy Institute.