The phrase 'touch on the issue' is correct and usable in written English.
It can be used when discussing a topic or problem to mean that the speaker is mentioning the topic briefly, but not going into detail. Example sentence: During the meeting, we only had time to touch on the issue, but will discuss it further in the next meeting.
In particular, no one seems willing to touch on the issue of "untouchability", despite the fact that 90% of the poorest of the poor in India are Dalits (who consider the term "untouchable" offensive).
It would be hard to accuse Mr Blair of being out of touch on the issue.
Administration officials said that the final proposal would touch on the issue, but they declined to provide further details on Monday.
CC: I want to touch on the issue around Michelle Obama and Jodi Kantor's portrayal of her as an angry black woman [in Kantor's recent book The Obamas].
But Earnest made a point of stressing that the review, first revealed by The Daily Beast, would not touch on the issue that has most vexed many families.
"Problems like visits to Yasukuni Shrine and the textbook problem remain issues with us because we can't touch on the issue of the emperor," said Kaoru Takamura, a novelist whose writing sometimes uses allegory to examines historical themes.
In this edition we examine this project and touch on the issues raised by the Institute's upcoming development of 25 bioclimatic residential dwellings, which will have experimental integrated wind turbines.
11.47am GMT Wolfgang Schauble also touched on the issue of immigration, saying that one cause of the political instability in Greece is the flow of migrants from Africa.
Boston was pleased it touched on the issue of depression.
It then touches on the issue of people living on the fringes of society.
The leaders' talks, which lasted more than three hours, touched on the issue of Iraq.
