DONALD Trump Junior has praised law enforcement officials for their response to the white powder attack that caused his wife to be rushed to a Manhattan hospital.

Vanessa Trump was hospitalised early this morning after she was exposed to a white, powdery substance when she opened an envelope that was addressed to her husband, Donald Trump Jr, police sources said, reports the New York Post.

“A special thanks today to the great men & women of the @NYPDnews @FDNY @secretservice @NewYorkFBI and the Joint Terrorism Task Force for their decisive action and incredible words of support to my wife and family,” Donald Jr. tweeted.

“Their professionalism under pressure made a rough day manageable.”

Vanessa Trump opened the letter at 10am (2am AEDT) at an East 54th Street apartment on the Upper East Side of Manhattan, sources told the New York Post.
She was taken to a local hospital as a precaution. The mysterious powder turned out to be cornflour.

The letter was mailed to the couple’s apartment and addressed to President Donald Trump’s 40-year-old son.

After the envelope was opened, three people at the residence, including Vanessa, were taken to New York Presbyterian/Weill Cornell Medical Center strictly as a precaution, according to reports.

A New York City Police Department spokesman told the AP that Mrs Trump was coughing and complained of nausea after being exposed to the substance.

“Thank you so much for all the help today in NYC!” Vanessa Trump tweeted on Monday night.

“I appreciate all the quick response to make sure that I was safe! Thank you @FDNY @secretservice @NYPDnews @NYPDCT @NewYorkFBI”

The envelope was addressed to Donald Trump Jr.

“Thankful that Vanessa & my children are safe and unharmed after the incredibly scary situation that occurred this morning,” Trump Jr. wrote in another tweet.

“Truly disgusting that certain individuals choose to express their opposing views with such disturbing behavior.”

Trump Jr married Vanessa in November 2005 at his father’s Mar-a-Lago estate in Palm Beach.