Today's edition of quick hits:
* A story we're watching: "Authorities were responding Tuesday afternoon to a report of a shooting at YouTube's California headquarters, a sheriff's spokeswoman told NBC News. No information on the possible shooter or shooters was immediately available."
* Alex van der Zwaan: "A London-based lawyer who admitted to lying to special counsel Robert Mueller's team in November 2017 was ordered Tuesday to serve 30 days in prison, the first sentence imposed since Mueller was appointed nearly a year ago."
* Census lawsuit: "A coalition of 17 states, Washington, D.C., and six cities announced Tuesday that they are suing to block the Trump administration from adding a citizenship question to the 2020 U.S. census."
* I assume he's talking about the National Guard? "President Donald Trump said Tuesday that he will reinforce security along the U.S. border with Mexico by using American troops because 'horrible, unsafe laws' have left the country vulnerable."
* An interesting new angle: "Deputy Attorney General Rod Rosenstein authorized special counsel Robert Mueller to investigate whether former Trump presidential campaign manager Paul Manafort colluded with the Russian government to affect the outcome of the 2016 election, according to a newly released classified memo."
* In related news: "Special counsel Robert Mueller has asked questions about the work of a private consulting firm that has undertaken projects for the United Arab Emirates, according to people familiar with the investigation, suggesting his probe is looking more deeply at foreign influence in Washington."
* Bad idea: "The Trump administration has introduced production quotas for immigration judges in an effort to reduce enormous court backlogs, raising concern among judges and attorneys that decisions may be unfairly rushed."
* Sen. Marco Rubio (R-Fla.) said he supports changing the law to prevent 18-year-olds from buying rifles. He's also trying to end the District of Columbia's ban on 18-year-olds buying rifles.
* Jill McCabe, an emergency room pediatrician who's married to former FBI Deputy Director Andrew McCabe, has heard Donald Trump's rhetoric about her family. She now wants to set the record straight.
* And in August 2016, Roger Stone said in an email to former Trump campaign aide Sam Nunberg, "I dined with Julian Assange last night." Stone now says that was a joke.
Anything to add? Consider this an open thread.